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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.

This device is hard to classify as a “residential” product, although of course it can certainly be used that way. Its main applications are small businesses, office buildings, rental properties, and so on. Even so, I found the device interesting in its own right, and I’m planning to use it at home. But you can read all about it in the review.

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.

After reviewing two phase-selection relays, I managed to arrange for a couple of interesting devices to be provided for review. One is aimed at the "household" market, while the other is more geared toward small businesses. Today I'm reviewing the first one, the RN-263T voltage relay.

Back in March, I was asked to write a review of the 1C15 mini oscilloscope. I can't say I was particularly eager, but I was curious to tinker with it. There were two reasons: it's a popular model, and I've also been asked several times about a simple oscilloscope for basic work on power supplies. Well, I finally got one and did a few tests.

At last, I’ve got my hands on a PD power supply that can deliver up to 100 W from a single output. As usual, I’ll take a look, test it, and of course, take it apart.

The RD official store has a new product: the adjustable RD6012 voltage converter. I thought this might be useful.

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.

At the end of February, I reviewed the PEF-301 phase selector relay. As I wrote then, I’ve been using these relays for a long time and am completely happy with how they work. But now a newer version, the PEF-320, has landed on my desk. The key difference is that it can’t control external contactors. More details, as always, 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.

A few more discounts and coupons from Banggood.

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.