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Not long ago, I posted a couple of reviews—one of a voltage converter and one of a power supply—and mentioned that I’d bought them specifically for a new version of one of my projects: a battery tester. Today, I’ll tell you a little about it.

A quick look at a handy little gadget. I bought a few to have on hand, and maybe I’ll include one with one of the new loads.

As I mentioned recently, I needed to build a powerful charger for one of my custom electronic loads. I’ve already shown you the converter, so now it’s time for the power supply. I’ve reviewed a similar SMPS before, which makes this all the more interesting—we’ll compare them.

A quick look at an inexpensive adjustable 60 V, 20 A voltage converter. It’s not exactly great, but I wouldn’t say it’s terrible either. Overall, you get what you pay for.

Na-ion batteries based on a relatively new chemistry (though that depends on how you look at it) have finally made their way to me. I bought them specifically for a review and to satisfy my own curiosity, and now I can share the results of some tests with you. I think you'll find them interesting.

Some time ago, I published a roundup of various products and included a nice-looking multimeter that can measure inductance. I also decided to buy one to review and test it, thinking it might be useful. Well, I received it yesterday, tested it, and decided to write a review while it was still fresh in my mind.

This article came about spontaneously. A few days ago, a friend messaged me saying his Mean Well UPS had stopped working: it runs for about an hour and a half, then shuts off, even though the battery is supposedly 12+12 Ah. By the way, this is the same friend who had previously sent me another Mean Well UPS to turn into a UPS :)

Yes, today this isn’t a review or an article, but a story. It’s about the TEC-80K electronic load, which is fairly popular and well known, and about my new device based on this controller.

Today, this isn't a review so much as a look back at my experience searching for, choosing and buying a tablet from one of our online stores, along with a few recommendations based on what I learned along the way. The tablet in question is the Microsoft Surface Pro 9.

Well, is it time for a tasty battery review? Meet the 4695-size lithium batteries. I hope you find this interesting.

The second test subjects from the batch I received—and this time, these are batteries I hadn't tested before. On top of that, they're simply more interesting than the previous ones.

I recently received three types of batteries to test, and decided it would be useful to share the results and my thoughts on them.

Yesterday, a package with Fnirsi's new battery impedance tester finally arrived. I spent most of today exploring its features, running a few tests, and writing this review. I'll say right away: I have a lot of work on at the moment and not much time, so I'll keep this relatively brief.

I was asked to share information about a sale on Fnirsi’s new milliohm meter. It looks like an interesting little device, so I thought it might be useful to you.

I think it's perfectly fair to call this post an advertisement. Yes, I decided to become, so to speak, a dealer (or representative) for one of the Ukrainian companies. Though the reality is a little more complicated, but that's beside the point. Anyway, I've added some useful, high-quality devices to my OLX page.

A couple of months ago, one of my readers sent me a RuiDeng power supply to test. Well, it’s sold under that brand, although as far as I understand, it has nothing to do with the company itself. He sent it to me because he’d seen my review of the same power supply, bought from the same store, but it turns out quite a few changes have been made since then.

Recently I announced a new product from RuiDeng: the RD6030 converter, with an output current of up to 30 A. It’s definitely an interesting new model, so I ordered one right away. Today I’m ready to take a closer look at it.

I've already explained how to turn an ordinary power supply into a charger, but for a long time I couldn't shake the thought that a charger should work more properly. Then I came up with the idea of making one that was not only proper and simple, but also based on the adapter board I'd already shown.