Electronics and technology blog    /    Materials for April 2021 year

There’s a discount on these TWS earbuds. I don’t use earbuds like these myself, since I mostly work from home, but judging by the reviews, there are no complaints about the quality. I thought they might come in handy for someone.

It all started when the battery in my old Q&Q “cuckoo” watch began to run down. When I went to check what kind of battery it used, I noticed cracks had appeared in the case. In the end, a crack in the case of my old watch led me to buy a new one, which is what I’m going to tell you about today.

In my review of an inductive balancer, I mentioned that capacitive balancers also exist. They transfer energy from one cell to another by charging and discharging capacitors. These balancers usually cost more, but thanks to one of my readers, I got my hands on one.

I recently published a review of the Samsung INR21700-50G batteries, where I also wrote that these cells offered the best capacity/size/maximum current ratio. But I recently finished testing other batteries of the same size and realized I was wrong last time: it turns out there are batteries with even higher capacity and maximum current.

High-current batteries in the very unusual 20650 form factor caught my interest mainly because of their size, and partly because of their discharge current of up to 30 A. Tests, comparisons, all the usual stuff.

No, friends, you’re not experiencing déjà vu—I really did review Samsung INR18650-25S batteries before, but those were bought locally. Today I’m reviewing the same batteries, but these came from VapCell. I ordered them partly for comparison.

At last, the new product from RDtech that I’ve genuinely been waiting for for a long time has arrived—and I even posted its announcement. Is it really that interesting, and does it live up to expectations? I’m curious to find out.

After reviewing the LTO batteries, I decided to run some life-cycle tests after all. I chose the second cell for the test because it looked noticeably better and had a capacity close to the claimed rating. I tested it in several modes, but I’ll go through them in order.