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Three and a half years ago, I reviewed the Teclast Tbook 10S tablet. I really liked it, and it saw fairly heavy use for almost the entire time since I wrote the review. But after about two and a half years, its battery started to give out, and by the three-year mark, it was basically running only on mains power, so I decided to replace it with a new one.

In the spring, I published two reviews of Vapcell batteries, both conventional lithium-ion and LiFePO4. Now I’ve got another batch of cells with this company’s logo. To avoid overwhelming readers with too many reviews, I split the batteries into several groups. Today I’m reviewing the first group.

A friend recently asked me to test a small battery for quadcopters and similar toys. I was curious, so that’s how I came up with the topic for today’s review.

I think many of my readers remember that I often test batteries, and for quite a while I've also had my eye on a dedicated battery tester. Yes, friends, today we're talking about the EBC-X electronic load and tester, which I finally bought :)

Some time ago, one of my readers asked me for advice and, while we were at it, offered to send me some INR18650-25R batteries for testing. He had bought them on AliExpress several years earlier. The test was done simply “out of curiosity” and wasn’t intended to serve any practical purpose, but I did find a few interesting things.

Yes, friends, the cycle-life test is back, and this time we have a genuine Sanyo NCR18650GA battery. But this isn't just a test: we're testing it under conditions the manufacturer doesn't recommend—in other words, we're deliberately killing the battery and seeing how it holds up.

A few times, I reviewed chargers for lithium batteries. They were designed for 3S packs, but the bigger issue was that their circuitry was far too simplified. After that, I was asked repeatedly which charger to buy that would be safer for the batteries and wouldn't need any "modifications"—even if it cost more. So I ordered a charger that supposedly belongs to the more proper type. As always, I'll go into more detail in the review.

I finally got my hands on the well-known ANR26650M1-B batteries from Lithium Werks (formerly A123). They’re considered among the highest-quality cells, and they can also handle a very high maximum load current.

Continuing my look at JGNE batteries, this time I’m testing three larger LiFePO4 models with capacities of 2300, 3000 and 3600 mAh. They differ not only in capacity, but also in maximum discharge current.

I was asked about LiFePO4 battery reviews not long ago, and recently I received a package containing both 18650 and 26650 cells. They differ not only in size, but also in their specifications, capacity, and maximum current. Since there are quite a few batteries, I decided to split them into three groups. Today, I’m reviewing the smallest ones.

I think you’re already familiar with these batteries from my two previous reviews, where I showed the Litokala and Varicor versions. Today, it’s VapCell’s turn.

LiFePO4 batteries with the highest maximum discharge current featured in my reviews so far: 55A. Unfortunately, I could only test them at 40A because of the limitations of my equipment.

This is the first time I’ve come across a combination of 5.3Ah capacity and a maximum current of 20A, but the batteries passed all the tests without any problems. More in the review.

Batteries in the actively promoted 21700 form factor, designed for a continuous discharge current of 20 A and rated at 4500 mAh.

This battery size isn't very common, but as I happened to find out, it's used as a replacement for packs of three AA batteries.

Batteries in the relatively uncommon 18350 form factor, but with a decent discharge current.

A relatively short series of reviews of VapCell batteries, featuring some interesting models in my opinion.

I recently published two reviews of 32700-size LiFePO4 batteries. At the time, I wrote that I’d like to use them as replacements for conventional lead-acid batteries. Then, quite by chance, I got my hands on a brand-new CSB HRL-1234W battery, the kind used in UPS units, and I wanted to see “what’s what.”