Another set of Vapcell LiFePO4 32700 batteries with a claimed capacity of 6200 mAh

We're back to off-grid power again, and today I have some 32700 LiFePO4 batteries on my desk. Why “again”? Because this is already my fourth review of batteries in this size, and my second review of similar batteries from Vapcell.

As usual, a reminder: to keep up with new posts on the blog, I recommend following me on Instagram. I'll post notifications about every new article there, and might also write about something interesting from time to time — link to my account

I'll just list all the reviews, especially since one of them covered replacing lead-acid batteries with LiFePO4, and I also tested how they perform in float mode at different voltages. Very useful and relevant.
VariCore 32700 LiFePO4 and a few thoughts on replacing lead-acid batteries in a UPS
Liitokala 32700 LiFePO4 and a comparison with similar VariCore batteries
VapCell IFR32700 6500mAh 30A G65 batteries: big, high-capacity, high-current

There's also a review where I revisited using these batteries in a UPS. That review will probably have a follow-up, since I want to use them in a small low-voltage UPS. The protection boards have already arrived :)

When I visited the Vapcell website, I was a little surprised to find that they have five versions of these batteries, with different capacities.



The packaging is “humble but neat.” In my opinion, though, this is actually the best option: no unnecessary extra cost.


Specifications from the Vapcell website
Model: G62
Size: 32.3±0.2*70.6±0.3mm
Typical Capacity: 6200mAh (0.2C discharge)
Min capacity: 6000mAh (0.2C discharge)
Nominal voltage: 3.20V
Max Continuous Discharge Current: 30A
Max Pulse Discharge Current: 55A for 5seconds
End-of-charge voltage: 3.65V
End-of-discharge Voltage: 2.0V
Weight: Max 150g
Internal resistance: Max 9mΩ（AC 1kHz）
Standard Charge: 6000mA,CCCV 50mA cut-off
Quick Charge Current: 18000mA

The stated capacity is 6200mAh, and the maximum discharge current is 30A. Their color reminded me of Liitokala batteries, which are also LiFePO4, by the way.


The dimensions and weight are nothing unusual.


Unfortunately, I also had to do the preliminary test with my main battery tester, but along the way I discovered a “catch.”
The thing is, the page for these batteries shows a picture of them being charged in Vapcell's own charger.


To be honest, I was pleased, since this would have sped up the testing a little: I could do the initial charge with another charger instead of the battery tester.
I got the charger out and set it up, and was glad the batteries fit. But my happiness didn't last long: they can't be charged in it. The charger's contacts don't reach the battery terminals. The photo shows the negative terminal, but take my word for it—the positive side is exactly the same.


By the way, the website has some other nice pictures too :)


So I had to run a “conditioning” cycle—charge/discharge/charge—on the same battery tester. Since it's single-channel, the whole process took a long time...
The first battery delivered more than the stated 6200.


The second one came in a little below 6200, but we'll see how much they vary on the summary graph. I usually put that together while preparing the review.


Two charging modes are specified: standard at 6A and fast at 18A.
In standard mode, charging took just over an hour—an excellent result.


But fast charging is much more interesting, since it really sets these batteries apart from ordinary ones, and especially from lead-acid batteries, which can only dream of charging like this.
A full charge took 26 minutes, and restoring 90% of the capacity was noticeably faster still.


The temperature after about 17 minutes, and the maximum temperature reached, look very good to me. The batteries accept charge well.


As with the other Vapcell batteries, the website has a graph of their own measurements.


The test was run at rates of 0.2, 0.5, 1C, and 10, 15, 20, and 30 A.

Well, overall, that's excellent: at 0.2C, they delivered more than 6300 mAh, and I easily got the rated 6200 mAh in every test mode.


The temperature is fine, but in my opinion, based on the graphs and measurements, their maximum continuous current is 20 A. They can handle more, but it's not advisable.
Measurements at 15, 20, and 30 A.


As expected, the second sample performed a little worse, but I still got 6233 mAh at 0.2C.


Its temperature was a couple of degrees higher than the previous one.


The combined graph at 0.2C, 1C, and 15 and 30 A shows that the second sample lags behind, albeit not by much.


Impedance measurements after delivery, after “normalization,” and after the tests—which, thanks to the “neighbors,” were actually a few more than planned.


As in the previous review, I ran a shorter test on the second pair at 0.2C, 1C, and 20 A. The results here are about the same as for the first pair.


Mostly for the sake of statistics: a check-weighing of the second pair, plus impedance measurements after delivery and after testing.


Now for what I think is more useful: first, a comparison of all four samples at 0.2C and 20 A.
Yes, there's some variation, but in my opinion, even the difference between the highest-capacity and weakest cell is only 1.5%, which isn't significant. You can see that even with name-brand cells.


And a comparison with other batteries:
1. The ones under review, sample 1
2. Vapcell G65
3. VariCore—I remember these dismal batteries :(
4. Liitokala, which turned out to be surprisingly decent.


Based on the test results, I can say that although these batteries fall short of the Vapcell G65 and Liitokala, that was to be expected even without testing—the rated capacity of both competitors is higher. Still, these batteries fully meet their stated specifications, namely:
Capacity in Ah
Energy in Wh
Maximum discharge current
Maximum charging current

If you find them at a reasonable price (with discounts, coupons, and so on), you can buy them without hesitation.

For now, the link goes to the Vapcell website, since the AliExpress store is temporarily on vacation. That's all from me—and may the lights in your homes never go out, no matter what!