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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.

A few deals that might be useful.

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.

You’ve probably heard of GaN technology by now, even if you’re not particularly interested in the world of modern power supply design. But this is the first time I’ve had a power supply like this, and today I’ll try comparing it with an almost identical model from the same company. Inspection, tests, comparison, measurements—as usual.

They sent over a coupon for three Choetech products, and I thought it might be useful.

The Choetech store manager sent me a deal and a coupon for a new charger (power supply) featuring GaN technology, two Type-C ports, and up to 100 W of power.

I've been asked more than once about an inexpensive, decent option for a basic soldering station. If you want something reasonably good, T12-tip stations are probably the way to go: they're more convenient than the rather old 900 series. Today I have a very brief review of just such an option.

For one of my projects, I bought a small protection board. Its specs are modest: 3S, up to 10 A. In fact, I needed even less, so today I'm not just reviewing the board, but also making a small modification.

The FNC88 USB tester, which has been shown many times before, has finally made its way to me. It’s made by a company with a very strange name: Fnirsi. Inspection, description, tests, conclusions—as usual.

I recently posted a review of 32700-size LiFePO4 batteries, but as you can imagine, you can't use batteries without a protection board, so I ordered one too. Since I had it on hand, I put together a short review in case it might be useful to someone.

This is the second product from the Choetech store that they sent me to review and test. This time, I’ll be taking a closer look at a charger (power supply) rated for up to 60 W, with Power Delivery support and a USB Type-C output. As usual, I’ll inspect it, run some tests, take it apart, and share my conclusions.

Even while writing the title, it felt a little unusual to describe a cable as “100 watts.” I’m more used to cables being rated by current, voltage, or wire gauge—but by power? Anyway, read on for the review and test of this 100 W PD cable.

I got the idea of modifying various uninterruptible power supplies—or, more specifically, switching them over to more modern batteries. To try it out, I ordered a few batteries, and today I’ll be doing not just a test but also a little investigation, if you can call it that.

I've had this hot air rework station sitting at home for a very long time. A friend lent it to me specifically for a review, but with the renovation going on, I just couldn't find the time. Finally, I picked it up to see what it's like, how it works, and of course to draw some conclusions, both positive and negative.

Almost as a follow-up—though actually, early this morning, the manager of the Choetech store emailed me some promo codes for various products in their store.