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Back to the topic of off-grid power. 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.

A couple of months ago, I was browsing AliExpress and came across some interesting power bank cases. What caught my eye was how often I saw them, in all sorts of variations, yet they all shared the same style: a colored cartridge inside a transparent case. Anyway, I ordered one and it arrived.

It's been quite a while since I last wrote about Vapcell batteries, but I recently received a package from them with four samples. So today, here's part one: 21700 batteries rated at 5200mAh.

I happened to get my hands on some batteries in the relatively uncommon 17650 form factor. I couldn't resist testing them, and as it turned out, I was right to do so.

Some batteries I’d never seen before landed in my hands—or, to be more precise, they first landed with a friend of mine. He wanted to find out more about them, so he asked me to test them in different modes and give him my opinion.

Today, I'm actually going to talk about a single power supply. The idea for this article came to me spontaneously while I was sorting through a pile of junk at home and came across one of the power supplies.

Some time ago, one of my readers got in touch and offered to let me test their new product, which had recently gone into production. And what can I say? I'm interested in all kinds of hardware, especially when it's smart. As always, I'll take a look, take it apart, run some tests, and share my conclusions.

Not long ago, one of my readers decided to buy batteries to replace the ones in his angle grinder battery pack. I was interested too, so I tagged along and ordered one to test.

A while ago, I posted a preview of my solar power station build on Instagram. Well, not only is it now installed, it’s also been generating power for three weeks. I’ve finally got around to writing up how I built it.

This isn’t a review, or even just a test. I’ve come across some unusual rulers (at least in my opinion), and today I’d like to show them to you. Maybe some of you have even used rulers like these.

A friend of mine had a manual sprayer, and we got the idea of converting it to battery power. Read this mini-review to see how it turned out.

Another measuring instrument. It’s not quite as original as the previous one, and it was made in a specialized factory, but I liked it all the same.

Today I’m reviewing a rather unusual measuring instrument. I saw it at a friend’s place and couldn’t resist showing it to you. I hope you find it interesting.

More batteries, and this time they’re also Sanyo cells from a teardown, but in the more compact 14500 size. The results are pretty good too, which is to be expected from branded batteries.

More batteries, this time from the well-known Sanyo brand. What makes them especially interesting is that I bought them from Nkon as Reclaimed. People often ask me whether it’s worth buying batteries like these from Nkon, since they can be quite a bargain. This review answers that question.

I've been asked about testing BAK batteries more than once, and I even had one of this company's products. But recently, circumstances worked out so that I got my hands on a few more batteries, and there was another BAK in the batch, which naturally caught my interest.

As it happened, a battery for an e-reader from the well-known Kindle brand ended up in my hands, and I decided to test it. I was especially interested because not only had I bought it on AliExpress, but it had also been sitting in a box for a couple of years.

About a month and a half ago, I decided to run a life test on a fairly well-known battery. I thought it might be useful.