VERY LOW CAPACITY
March 7, 2017
I have a lot of experience with lithium batteries, and these are my first AAA style cells as I normally use plain brick cells. They came with the standard charge of 3.87v, a good sign, but I had to charge them super slowly at 0.1A to keep the voltage down and get more capacity in which was only 25mAh to reach 4.2v at 0.1A. After the charge it dropped to 4.05v. For testing I ran it down to a safe 3.000v 3 times using an 8ohm then 10ohm then 25ohm load until the voltage drop became very rapid signaling it is about empty. By the way these tend to hold their voltage around 3.6-3.45v average even without a load, kind of low. After the thoroughly, but not too deeply draining the 2 I bought, I charged them for about 80 minutes at 0.1A and put about 120mAh back in. I expected at least 250-350mah for a "500mah". I have to admit they work, but are not powerful. If I was looking to get cheap batteries I would have just aimed for cheap ones, I got mislead somewhere else that ultrafire was very good, now all I hear is how overrated and bad they are. I have them now and don't need high performance, so I'll keep them.
ProsThey work, and can last a reasonable amount of time in low power devices
ConsOnly 120mAh of useable capacity, weak voltage.