30 Batteries: 2021 Review Roundup
As 2021 draws to a close, and following tradition, I decided to publish my annual roundup of battery reviews.
This time there are fewer than I expected, but I hope it will still be useful.
As usual, a reminder: to keep up with new posts on the blog, I recommend following me on Instagram, where I'll post notifications about every new topic and maybe write about something interesting now and then — link to my account
Just in case, I'll start with links to previous posts, especially since some of the batteries and tests are still relevant today.
2016 Comprehensive testing of various batteries
2019 28 types of batteries in one review
2020 42 Batteries: Review Roundup
A note about this roundup.
As last year, most of the batteries came from AliExpress/Alibaba, but some were sent in by readers, and others were bought from a Ukrainian store.
The categories are somewhat arbitrary, but they make it easier to understand what each battery is intended for. Models with protection are shown in bold.
High-drain
Mid-range
High-capacity
Other Li-Ion
LiFePO4 and LTO
.
Since the testing procedure was the same as in the previous tests, I'll simply repeat what I wrote earlier:
First, a preliminary run in a basic charger/discharger to measure capacity, followed by cycles at 0.2C, 0.5C, and 1C, then depending on the battery, at 1, 2, 3, or 4C, or at 2C, 10, 15, or 20A, with temperature measurements.
Throughout the process, I tried to stick to the same procedure, so the results in this roundup will be presented according to the same format:
1. Packaging type (box — a simple box, case — with a clasp), price, store link, review link.
2. Appearance
3. Dimensions and weight
4. “Break-in” cycle
5. Charging graph in the recommended “normal” mode after discharging at 0.2C
6. Discharge graphs at different currents for the first battery, plus thermal images at maximum settings
7. The same for the second battery
8. Impedance measurements before testing, after “break-in,” and at the end
The only thing that's changed since last year is the thermal camera (the photo still shows the old one); I now have a model with higher resolution. Everything else is unchanged.
.
Packaging: plastic case
Price: $17.98 per pair + case
Link to product
Link to review
Specifications from the VapCell website.
Model: INR26650 4200mah 32A
Typical Capacity: 4200mAh (0.2C discharge)
Min capacity: 4100mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 32A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 95g ( Appr)
Internal resistance: 11mΩ ( Appr)（AC 1kHz）
Standard Charge: 2000mA,CCCV 100mA cut-off
Quick Charge Current: 3000mA
The specs are quite accurate; the only disappointing thing is the noticeable variation between cells.
.
Packaging: cardboard
Price: $14.80 per pair
Link to product
Link to review
These are genuine Samsung INR18650-25S cells, sold by the Vapcell store
I had no complaints about the quality, only about the price.
.
Packaging: plastic case
Price: $15.99 per pair + case
Link to product
Link to review
Specifications from the Vapcell website.
Model: INR18650 2000mah 38A
Size: 18.3*65.0mm
Typical Capacity: 2000mAh (0.2C discharge)
Min capacity: 1900mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 38A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 48g ( Appr)
Internal resistance: 8mΩ ( Appr)（AC 1kHz）
Standard Charge: 1000mA,CCCV 100mA cut-off
Quick Charge Current: 4000mA
Presumably these are the same Samsung 20S cells, so there are no issues with current delivery or any of the other specs.
.
Packaging: plastic case
Price: $13.99 per pair + case
Link to product
Link to review
Model: T20
Size: 21.6*70.9mm
Typical Capacity: 2000mAh (0.2C discharge)
Min capacity: 1900mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current:40A
Max Discharge Current: 60A with 80℃ cut
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 72g ( Appr)
Internal resistance: 8mΩ ( Appr) （AC 1kHz）
Standard Charge: 2000mA,CCCV 100mA cut-off
Quick Charge Current: 15000mA
These are interesting cells in their own right, comfortably delivering 40A continuously. Though with such a low capacity, “continuously” doesn't last very long.
.
Packaging: plastic case
Price: $17.99 per pair + case
Link to product
Link to review
Model: K40
Size: 21.1*70.6mm
Typical Capacity: 4000mAh (0.2C discharge)
Min capacity: 3900mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current:30A
Max Discharge Current: 45A with 80℃ cut
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 68g ( Appr)
Internal resistance: 10mΩ ( Appr) （AC 1kHz）
Standard Charge: 2000mA,CCCV 100mA cut-off
Quick Charge Current: 6000mA
These batteries aren't particularly remarkable. There are models with higher capacity and models that can deliver more current; these are more of a middle-of-the-road option. Still, my tests showed that there's a very good chance these are Samsung INR21700-40T cells in different "clothing."
.
Packaging: cardboard
Price: $20.24 per pair
Link to product
Link to review
These batteries have a rather unusual form factor—or, more precisely, a larger diameter. They're essentially somewhere between an 18650 and a 20700 (not to be confused with a 21700). Unfortunately, it turned out they're not very good...
.
As before, here are comparisons of all the batteries in this section at 0.2C, 1C and a rate close to the maximum.
Of course, the comparison isn't entirely fair, but I think there's still useful information to be found here.
1C
30A, the highest current common to all of them, although some can deliver more.
.
Packaging: plastic case
Price: $12.99 per pair + case
Link to product
Link to review
Model: K15
Size: 18.2*50.0mm
Typical Capacity: 1500mAh (0.2C discharge)
Min capacity: 1400mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 15A
Max Discharge Current: 25A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 37g ( Appr)
Internal resistance: 20mΩ ( Appr) （AC 1kHz）
Standard Charge: 500mA,CCCV 100mA cut-off
Quick Charge Current: 2000mA
I can't really say these are good batteries, but I don't see much reason to criticize them either, especially given their maximum current and unusual form factor.
.
Packaging: plastic case
Price: $14.99 per pair + case
Link to product
Link to review
Model: K54
Size: 26.4*65.1mm
Typical Capacity: 5400mAh (0.2C discharge)
Min capacity: 5250mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 15A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 98g ( Appr)
Internal resistance: 19mΩ ( Appr)（AC 1kHz）
Standard Charge: 2000mA,CCCV 100mA cut-off
Quick Charge Current: 4000mA
These batteries use a well-known but gradually disappearing form factor. The cells themselves are decent, but their capacity falls a little short of the stated figure.
.
Packaging: plastic case
Price: $17.99 per pair + case
Link to product
Link to review
Model: P30
Size: 18.3*65.0mm
Typical Capacity: 3000mAh (0.2C discharge)
Min capacity: 2850mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 20A
Max Discharge Current: 35A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 48g ( Appr)
Internal resistance: 15mΩ ( Appr) （AC 1kHz）
Standard Charge: 1000mA,CCCV 100mA cut-off
Quick Charge Current: 4000mA
The battery specs are similar to those of well-known cells like the HG2 and VTC6, but the wide variation in performance and high price are disappointing.
.
Packaging: plastic case
Price: $16.77 per pair + case
Link to product
Link to review
Model: K31
Size: 18.4*65.2mm
Typical Capacity: 3150mAh (0.2C discharge)
Min capacity: 3050mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 18A
Max Discharge Current: 35A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 48g ( Appr)
Internal resistance: 16mΩ ( Appr) （AC 1kHz）
Standard Charge: 1500mA,CCCV 100mA cut-off
Quick Charge Current: 4000mA
In my opinion, these batteries are completely unremarkable, but I wouldn't call them bad either. Still, you'd be better off buying something from a reputable brand instead.
.
Packaging: plastic case
Price: $30.59 per pair + case
Link to product
Link to review
Model: T50
Typical capacity: 5000 mAh (0.2C discharge)
Minimum capacity: 4900 mAh (0.2C discharge)
Nominal voltage: 3.60 V
Max continuous discharge: 20 A
Max current: 35 A
Charge termination voltage: 4.20 V
Discharge cutoff voltage: 2.5 V
Weight: 72 g (approx.)
Internal resistance: 12 mΩ (approx.) (1 kHz AC)
Standard charging: 2000 mA, CCCV cutoff at 100 mA
Fast charging current: 5000 mA
There's every reason to believe this is an INR21700-50S, and I can say that its specs are top-notch, but unfortunately, the price isn't.
.
As before, here are comparisons of all the batteries in this section at 0.2C, 1C, and near-maximum discharge rates.
The comparison isn't entirely fair, but I think there's still useful information to be found.
1C
15 A, the highest current common to all of them, although some can deliver more.
.
Packaging: cardboard
Price: $15.99 per pair
Link to product
Link to review
These are pretty good genuine batteries. If the price works for you, I recommend them.
.
Packaging: cardboard
Price: $15.98 per pair
Link to product
Link to review
These batteries are definitely interesting and high quality. I recommend them.
.
Packaging: cardboard
Price: $15.99 per pair
Link to product
Link to review
Typical capacity: 4800mAh
Minimum capacity: 4650mAh
Maximum charging voltage: 4.2V (4.15V for cycle life)
Nominal voltage: 3.64V
Charge method: CC-CV
Charging current rate: 0.33C (1584mA)
Discharge cut-off voltage: 2.5V (3.0V for cycle life)
Cycle life: 3000 to 70%
Decent branded batteries—I’d even say they’re good—but I wish they had a little more capacity.
.
Packaging: cardboard
Price: $27.79 per 10
Link to product
Link to review
Yes, I know, Liitokala. Yes, I know they’re ripping people off, but these are actually decent budget batteries that I can recommend for all sorts of non-critical applications.
.
Packaging: cardboard
Price: $16.59 per pair
Link to product
Link to review
These are genuine high-capacity batteries with a decent discharge rate, and I can definitely recommend them.
.
Packaging: plastic case
Price: $17.99 per pair + case
Link to product
Link to review
Model: P50
Size: 21.3*70.7mm
Typical Capacity: 5000mAh (0.2C discharge)
Min capacity: 4900mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 15A
Max Discharge Current: 25A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 72g ( Appr)
Internal resistance: 15mΩ ( Appr) （AC 1kHz）
Standard Charge: 2000mA,CCCV 100mA cut-off
Quick Charge Current: 4000mA
Very good batteries. Their results are similar to the Samsung 50G, though they differ slightly.
.
Packaging: plastic case
Price: $14.99 per pair + case
Link to product
Link to review
Model: F32
Size: 18.4*65.0mm
Typical Capacity: 3200mAh (0.2C discharge)
Min capacity: 3100mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 10A
Max Discharge Current: 20A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 48g ( Appr)
Internal resistance: 28mΩ ( Appr) （AC 1kHz）
Standard Charge: 1000mA,CCCV 100mA cut-off
Quick Charge Current: 2500mA
These are very ordinary batteries, with nothing in particular to set them apart.
.
Packaging: plastic case
Price: $15.99 per pair + case
Link to product
Link to review
Model: F34
Size: 18.4*65.0mm
Typical Capacity: 3400mAh (0.2C discharge)
Min capacity: 3300mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 10A
Max Discharge Current: 20A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 48g ( Appr)
Internal resistance: 24mΩ ( Appr) （AC 1kHz）
Standard Charge: 1000mA,CCCV 100mA cut-off
Quick Charge Current: 2000mA
They are very similar to the F32, but have slightly higher capacity at the same maximum current.
.
As before, here is a comparison of all the batteries in this section at 0.2C, 1C and near-maximum discharge rates.
The comparison isn't entirely fair, but I think there's still useful information to be found here.
1C
10A as the maximum common to all of them, although some can deliver more.
.
Packaging: plastic case
Price: $10.99 per pair + case
Link to product
Link to review
Typical Capacity: 1100mAh (0.2C discharge)
Min capacity: 1050mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 6A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 28g ( Appr)
Internal resistance: 18mΩ ( Appr)（AC 1kHz）
Standard Charge: 500mA,CCCV 100mA cut-off
Quick Charge Current: 1500mA
Another pair of batteries in a rare form factor. They're essentially elongated 14500 cells, but otherwise there's nothing particularly unusual about them.
.
Packaging: plastic case
Price: $12.99 per pair + case
Link to product
Link to review
Model: F14
Size: 18.3*35.0mm
Typical Capacity: 1400mAh (0.2C discharge)
Min capacity: 1350mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 3A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 26g ( Appr)
Internal resistance: 65mΩ ( Appr)（AC 1kHz）
Standard Charge: 500mA,CCCV 100mA cut-off
Quick Charge Current: 1000mA
Surprisingly good batteries; the only complaint was the price.
.
Packaging: none
Price: €1.95 each
Link to product
Link to review
These batteries are in the budget class, as their only distinguishing feature is their price. There have also been complaints about this brand's batteries having a high self-discharge rate.
.
Packaging: plastic case
Price: $21.99 for a pair + case
Link to product
Link to review
Model: INR21700 5000mah 10A
Size: 21.1*70.5mm
Typical Capacity: 5000mAh (0.2C discharge)
Min capacity: 4800mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 10A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 76g ( Appr)
Internal resistance: 28mΩ ( Appr)（AC 1kHz）
Standard Charge: 1500mA,CCCV 100mA cut-off
Quick Charge Current: 2500mA
Cycle life: 1C discharge / 70% DOD, ≥ 800 cycles
These are some of the most unusual batteries I've come across. What sets them apart is that they not only have good capacity and built-in charging, but can also work as a power bank.
.
Packaging: cardboard
Price: $21.99 per pair
Link to product
Link to review
These batteries are genuinely interesting and have one major advantage: they work at low temperatures. But the price...
.
Packaging: none
Price: $7 each
Link to product
Link to review
Type: LiNiCoMnO2
Capacity: 7000 mAh
Continuous discharge current: 20 A
Maximum discharge current: 34 A
Internal resistance
Only one charging current is specified: 6 A
.
Packaging: none
Price: $43 each
Link to product
Link to review
Very interesting batteries: high capacity in a compact size and decent current output. What concerned me was that they had swollen slightly after the tests; more on that in the review.
.
Packaging: cardboard
Price: $18.85 each
Link to product
Link to review
The batteries are clearly used, but worse, they have different specifications.
.
Packaging: none
Price: $2.4 each
Link to product
Link to review
The batteries were a real disappointment, both in terms of their performance and the consistency of their specs. On the plus side, I did a cycle-life test; if you're interested, you can find it via the review link.
.
Packaging: none
Price: $70 each
Link to product
Link to review
Decent batteries, well suited for UPS units and renewable energy systems.
.
Packaging: plastic case
Price: $17.99 per pair + case
Link to the product
Link to the review
These batteries have already been covered in my earlier reviews. In short, they're excellent... except for the price.
I'd certainly like to run some more comparisons, but I can't think of any specific ones that would be interesting. In any case, if you need more details or additional comparisons, it's worth checking out the review of the battery you're interested in first. There's a good chance it includes more comparative graphs.
There's no point comparing prices at all, since some of them are no longer very relevant, especially lately, unfortunately.
That's all from me. I hope you found it useful. By the way, there's a chance this digest will be the last one; it's unlikely there will be enough “test subjects” next year.
This time there are fewer than I expected, but I hope it will still be useful.
As usual, a reminder: to keep up with new posts on the blog, I recommend following me on Instagram, where I'll post notifications about every new topic and maybe write about something interesting now and then — link to my account
Just in case, I'll start with links to previous posts, especially since some of the batteries and tests are still relevant today.
2016 Comprehensive testing of various batteries
2019 28 types of batteries in one review
2020 42 Batteries: Review Roundup
A note about this roundup.
As last year, most of the batteries came from AliExpress/Alibaba, but some were sent in by readers, and others were bought from a Ukrainian store.
The categories are somewhat arbitrary, but they make it easier to understand what each battery is intended for. Models with protection are shown in bold.
Contents:
High-drain
Vapcell T20 21700 2000mAh 40A/60A
Mid-range
High-capacity
Other Li-Ion
LiFePO4 and LTO
Introduction
.
Since the testing procedure was the same as in the previous tests, I'll simply repeat what I wrote earlier:
First, a preliminary run in a basic charger/discharger to measure capacity, followed by cycles at 0.2C, 0.5C, and 1C, then depending on the battery, at 1, 2, 3, or 4C, or at 2C, 10, 15, or 20A, with temperature measurements.
Throughout the process, I tried to stick to the same procedure, so the results in this roundup will be presented according to the same format:
1. Packaging type (box — a simple box, case — with a clasp), price, store link, review link.
2. Appearance
3. Dimensions and weight
4. “Break-in” cycle
5. Charging graph in the recommended “normal” mode after discharging at 0.2C
6. Discharge graphs at different currents for the first battery, plus thermal images at maximum settings
7. The same for the second battery
8. Impedance measurements before testing, after “break-in,” and at the end
The only thing that's changed since last year is the thermal camera (the photo still shows the old one); I now have a model with higher resolution. Everything else is unchanged.
Vapcell 26650 4200mAh
.
Packaging: plastic case
Price: $17.98 per pair + case
Link to product
Link to review
Specifications from the VapCell website.
Model: INR26650 4200mah 32A
Typical Capacity: 4200mAh (0.2C discharge)
Min capacity: 4100mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 32A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 95g ( Appr)
Internal resistance: 11mΩ ( Appr)（AC 1kHz）
Standard Charge: 2000mA,CCCV 100mA cut-off
Quick Charge Current: 3000mA
The specs are quite accurate; the only disappointing thing is the noticeable variation between cells.
Vapcell Samsung INR18650-25S
.
Packaging: cardboard
Price: $14.80 per pair
Link to product
Link to review
These are genuine Samsung INR18650-25S cells, sold by the Vapcell store
I had no complaints about the quality, only about the price.
Vapcell INR18650 2000mAh
.
Packaging: plastic case
Price: $15.99 per pair + case
Link to product
Link to review
Specifications from the Vapcell website.
Model: INR18650 2000mah 38A
Size: 18.3*65.0mm
Typical Capacity: 2000mAh (0.2C discharge)
Min capacity: 1900mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 38A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 48g ( Appr)
Internal resistance: 8mΩ ( Appr)（AC 1kHz）
Standard Charge: 1000mA,CCCV 100mA cut-off
Quick Charge Current: 4000mA
Presumably these are the same Samsung 20S cells, so there are no issues with current delivery or any of the other specs.
Vapcell T20 21700 2000mAh 40A/60A
.
Packaging: plastic case
Price: $13.99 per pair + case
Link to product
Link to review
Model: T20
Size: 21.6*70.9mm
Typical Capacity: 2000mAh (0.2C discharge)
Min capacity: 1900mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current:40A
Max Discharge Current: 60A with 80℃ cut
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 72g ( Appr)
Internal resistance: 8mΩ ( Appr) （AC 1kHz）
Standard Charge: 2000mA,CCCV 100mA cut-off
Quick Charge Current: 15000mA
These are interesting cells in their own right, comfortably delivering 40A continuously. Though with such a low capacity, “continuously” doesn't last very long.
Vapcell K40 21700
.
Packaging: plastic case
Price: $17.99 per pair + case
Link to product
Link to review
Model: K40
Size: 21.1*70.6mm
Typical Capacity: 4000mAh (0.2C discharge)
Min capacity: 3900mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current:30A
Max Discharge Current: 45A with 80℃ cut
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 68g ( Appr)
Internal resistance: 10mΩ ( Appr) （AC 1kHz）
Standard Charge: 2000mA,CCCV 100mA cut-off
Quick Charge Current: 6000mA
These batteries aren't particularly remarkable. There are models with higher capacity and models that can deliver more current; these are more of a middle-of-the-road option. Still, my tests showed that there's a very good chance these are Samsung INR21700-40T cells in different "clothing."
LG 20650 HG6
.
Packaging: cardboard
Price: $20.24 per pair
Link to product
Link to review
These batteries have a rather unusual form factor—or, more precisely, a larger diameter. They're essentially somewhere between an 18650 and a 20700 (not to be confused with a 21700). Unfortunately, it turned out they're not very good...
Comparison graphs
.
As before, here are comparisons of all the batteries in this section at 0.2C, 1C and a rate close to the maximum.
Of course, the comparison isn't entirely fair, but I think there's still useful information to be found here.
1C
30A, the highest current common to all of them, although some can deliver more.
Vapcell K15 18500
.
Packaging: plastic case
Price: $12.99 per pair + case
Link to product
Link to review
Model: K15
Size: 18.2*50.0mm
Typical Capacity: 1500mAh (0.2C discharge)
Min capacity: 1400mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 15A
Max Discharge Current: 25A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 37g ( Appr)
Internal resistance: 20mΩ ( Appr) （AC 1kHz）
Standard Charge: 500mA,CCCV 100mA cut-off
Quick Charge Current: 2000mA
I can't really say these are good batteries, but I don't see much reason to criticize them either, especially given their maximum current and unusual form factor.
Vapcell 26650 K54
.
Packaging: plastic case
Price: $14.99 per pair + case
Link to product
Link to review
Model: K54
Size: 26.4*65.1mm
Typical Capacity: 5400mAh (0.2C discharge)
Min capacity: 5250mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 15A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 98g ( Appr)
Internal resistance: 19mΩ ( Appr)（AC 1kHz）
Standard Charge: 2000mA,CCCV 100mA cut-off
Quick Charge Current: 4000mA
These batteries use a well-known but gradually disappearing form factor. The cells themselves are decent, but their capacity falls a little short of the stated figure.
Vapcell P30 18650
.
Packaging: plastic case
Price: $17.99 per pair + case
Link to product
Link to review
Model: P30
Size: 18.3*65.0mm
Typical Capacity: 3000mAh (0.2C discharge)
Min capacity: 2850mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 20A
Max Discharge Current: 35A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 48g ( Appr)
Internal resistance: 15mΩ ( Appr) （AC 1kHz）
Standard Charge: 1000mA,CCCV 100mA cut-off
Quick Charge Current: 4000mA
The battery specs are similar to those of well-known cells like the HG2 and VTC6, but the wide variation in performance and high price are disappointing.
Vapcell K31 18650
.
Packaging: plastic case
Price: $16.77 per pair + case
Link to product
Link to review
Model: K31
Size: 18.4*65.2mm
Typical Capacity: 3150mAh (0.2C discharge)
Min capacity: 3050mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 18A
Max Discharge Current: 35A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 48g ( Appr)
Internal resistance: 16mΩ ( Appr) （AC 1kHz）
Standard Charge: 1500mA,CCCV 100mA cut-off
Quick Charge Current: 4000mA
In my opinion, these batteries are completely unremarkable, but I wouldn't call them bad either. Still, you'd be better off buying something from a reputable brand instead.
Vapcell 21700 T50
.
Packaging: plastic case
Price: $30.59 per pair + case
Link to product
Link to review
Model: T50
Typical capacity: 5000 mAh (0.2C discharge)
Minimum capacity: 4900 mAh (0.2C discharge)
Nominal voltage: 3.60 V
Max continuous discharge: 20 A
Max current: 35 A
Charge termination voltage: 4.20 V
Discharge cutoff voltage: 2.5 V
Weight: 72 g (approx.)
Internal resistance: 12 mΩ (approx.) (1 kHz AC)
Standard charging: 2000 mA, CCCV cutoff at 100 mA
Fast charging current: 5000 mA
There's every reason to believe this is an INR21700-50S, and I can say that its specs are top-notch, but unfortunately, the price isn't.
Comparison graphs
.
As before, here are comparisons of all the batteries in this section at 0.2C, 1C, and near-maximum discharge rates.
The comparison isn't entirely fair, but I think there's still useful information to be found.
1C
15 A, the highest current common to all of them, although some can deliver more.
Murata VC7
.
Packaging: cardboard
Price: $15.99 per pair
Link to product
Link to review
These are pretty good genuine batteries. If the price works for you, I recommend them.
Samsung INR21700-50G
.
Packaging: cardboard
Price: $15.98 per pair
Link to product
Link to review
These batteries are definitely interesting and high quality. I recommend them.
Samsung INR21700-48X
.
Packaging: cardboard
Price: $15.99 per pair
Link to product
Link to review
Typical capacity: 4800mAh
Minimum capacity: 4650mAh
Maximum charging voltage: 4.2V (4.15V for cycle life)
Nominal voltage: 3.64V
Charge method: CC-CV
Charging current rate: 0.33C (1584mA)
Discharge cut-off voltage: 2.5V (3.0V for cycle life)
Cycle life: 3000 to 70%
Decent branded batteries—I’d even say they’re good—but I wish they had a little more capacity.
Liitokala NCR18650B_Protected
.
Packaging: cardboard
Price: $27.79 per 10
Link to product
Link to review
Yes, I know, Liitokala. Yes, I know they’re ripping people off, but these are actually decent budget batteries that I can recommend for all sorts of non-critical applications.
Vapcell LG INR18650-MJ1
.
Packaging: cardboard
Price: $16.59 per pair
Link to product
Link to review
These are genuine high-capacity batteries with a decent discharge rate, and I can definitely recommend them.
Vapcell P50 21700 5000mAh
.
Packaging: plastic case
Price: $17.99 per pair + case
Link to product
Link to review
Model: P50
Size: 21.3*70.7mm
Typical Capacity: 5000mAh (0.2C discharge)
Min capacity: 4900mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 15A
Max Discharge Current: 25A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 72g ( Appr)
Internal resistance: 15mΩ ( Appr) （AC 1kHz）
Standard Charge: 2000mA,CCCV 100mA cut-off
Quick Charge Current: 4000mA
Very good batteries. Their results are similar to the Samsung 50G, though they differ slightly.
Vapcell F32 18650
.
Packaging: plastic case
Price: $14.99 per pair + case
Link to product
Link to review
Model: F32
Size: 18.4*65.0mm
Typical Capacity: 3200mAh (0.2C discharge)
Min capacity: 3100mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 10A
Max Discharge Current: 20A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 48g ( Appr)
Internal resistance: 28mΩ ( Appr) （AC 1kHz）
Standard Charge: 1000mA,CCCV 100mA cut-off
Quick Charge Current: 2500mA
These are very ordinary batteries, with nothing in particular to set them apart.
Vapcell F34 18650
.
Packaging: plastic case
Price: $15.99 per pair + case
Link to product
Link to review
Model: F34
Size: 18.4*65.0mm
Typical Capacity: 3400mAh (0.2C discharge)
Min capacity: 3300mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 10A
Max Discharge Current: 20A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 48g ( Appr)
Internal resistance: 24mΩ ( Appr) （AC 1kHz）
Standard Charge: 1000mA,CCCV 100mA cut-off
Quick Charge Current: 2000mA
They are very similar to the F32, but have slightly higher capacity at the same maximum current.
Comparison graphs
.
As before, here is a comparison of all the batteries in this section at 0.2C, 1C and near-maximum discharge rates.
The comparison isn't entirely fair, but I think there's still useful information to be found here.
1C
10A as the maximum common to all of them, although some can deliver more.
Vapcell 14650 V11
.
Packaging: plastic case
Price: $10.99 per pair + case
Link to product
Link to review
Typical Capacity: 1100mAh (0.2C discharge)
Min capacity: 1050mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 6A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 28g ( Appr)
Internal resistance: 18mΩ ( Appr)（AC 1kHz）
Standard Charge: 500mA,CCCV 100mA cut-off
Quick Charge Current: 1500mA
Another pair of batteries in a rare form factor. They're essentially elongated 14500 cells, but otherwise there's nothing particularly unusual about them.
Vapcell 18350 F14
.
Packaging: plastic case
Price: $12.99 per pair + case
Link to product
Link to review
Model: F14
Size: 18.3*35.0mm
Typical Capacity: 1400mAh (0.2C discharge)
Min capacity: 1350mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 3A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 26g ( Appr)
Internal resistance: 65mΩ ( Appr)（AC 1kHz）
Standard Charge: 500mA,CCCV 100mA cut-off
Quick Charge Current: 1000mA
Surprisingly good batteries; the only complaint was the price.
BAK N18650CK 3000mAh
.
Packaging: none
Price: €1.95 each
Link to product
Link to review
These batteries are in the budget class, as their only distinguishing feature is their price. There have also been complaints about this brand's batteries having a high self-discharge rate.
Vapcell P2150A 21700
.
Packaging: plastic case
Price: $21.99 for a pair + case
Link to product
Link to review
Model: INR21700 5000mah 10A
Size: 21.1*70.5mm
Typical Capacity: 5000mAh (0.2C discharge)
Min capacity: 4800mAh (0.2C discharge)
Nominal voltage: 3.60V
Max Continuous Discharge Current: 10A
End-of-charge voltage: 4.20V
End-of-discharge Voltage: 2.5V
Weight: 76g ( Appr)
Internal resistance: 28mΩ ( Appr)（AC 1kHz）
Standard Charge: 1500mA,CCCV 100mA cut-off
Quick Charge Current: 2500mA
Cycle life: 1C discharge / 70% DOD, ≥ 800 cycles
These are some of the most unusual batteries I've come across. What sets them apart is that they not only have good capacity and built-in charging, but can also work as a power bank.
Boston power swing 5300
.
Packaging: cardboard
Price: $21.99 per pair
Link to product
Link to review
These batteries are genuinely interesting and have one major advantage: they work at low temperatures. But the price...
Yuliang Li-NMC 26800 7000mAh
.
Packaging: none
Price: $7 each
Link to product
Link to review
Type: LiNiCoMnO2
Capacity: 7000 mAh
Continuous discharge current: 20 A
Maximum discharge current: 34 A
Internal resistance
Only one charging current is specified: 6 A
LiNiCoMnO2 CATL 3.7V 50Ah
.
Packaging: none
Price: $43 each
Link to product
Link to review
Very interesting batteries: high capacity in a compact size and decent current output. What concerned me was that they had swollen slightly after the tests; more on that in the review.
LiitoKala LiFePO4 30Ah
.
Packaging: cardboard
Price: $18.85 each
Link to product
Link to review
The batteries are clearly used, but worse, they have different specifications.
LTO18650 1500
.
Packaging: none
Price: $2.4 each
Link to product
Link to review
The batteries were a real disappointment, both in terms of their performance and the consistency of their specs. On the plus side, I did a cycle-life test; if you're interested, you can find it via the review link.
LiFePO4 EVE Energy 3.2V 90Ah
.
Packaging: none
Price: $70 each
Link to product
Link to review
Decent batteries, well suited for UPS units and renewable energy systems.
Vapcell ANR26650M1-B
.
Packaging: plastic case
Price: $17.99 per pair + case
Link to the product
Link to the review
These batteries have already been covered in my earlier reviews. In short, they're excellent... except for the price.
I'd certainly like to run some more comparisons, but I can't think of any specific ones that would be interesting. In any case, if you need more details or additional comparisons, it's worth checking out the review of the battery you're interested in first. There's a good chance it includes more comparative graphs.
There's no point comparing prices at all, since some of them are no longer very relevant, especially lately, unfortunately.
That's all from me. I hope you found it useful. By the way, there's a chance this digest will be the last one; it's unlikely there will be enough “test subjects” next year.
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аккумуляторная батарея f34 18650 3400mah 10a/20a какой состав, тест аккумуляторов за рулем 2021
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