UltraFire UF AAA 10440 500mAh 3.6V Unprotected Lithium Ion (Li-ion) Button Top Battery - Bulk

This battery works in the LUMAPOWER EDC LM2 flashlight. It is listed as 10440 but is a little bit shorter than the Trustfire 10440 batteries that I ordered at the same time which do not work in that flashlight. These may actually be 10400 type but whatever they are they work in the flashlight.

Started using them in several AAA flashlights that I determined would handle the extra voltage,HUGE increase in output, I limit the run time to keep the temp down.But a nice wow demo to amaze the general public.....(non flashaholics).

I purchased 4 PKCell 10440 AAA batteries from Durnergy at Amazon for my Streamlight 66318 Microstream flashlight and they all worked. I tried the PKCell batteries because I previously purchased 4 UltraFire 10440 batteries from Battery Junction and all 4 were duds; the supplier replaced the original 4 and 3 of the 4 were duds. Good customer service...Read MoreRead more about I purchased 4 PKCell 10440 AAA

from Battery Junction but only one working UltraFire out of 8??? Allthough, the supplier refunded my money they would not acknowledge the dud batteries and said the problem was my flashlight. Not likely, I have been using the flashlight since 2016 with good higher voltage (3.7 volt) UltraFire 10440 batteries. Perhaps UltraFire's quality control is not what it once was. I will not risk buying UltraFire again. You Figure!! Read LessRead less about I purchased 4 PKCell 10440 AAA

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 drop...Read MoreRead more about I have a lot of experience with

ped 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. Read LessRead less about I have a lot of experience with

I was looking for a lithium replacement for the standard four cell arangement in my Kyosho Mini-Z fleet. The power delevery is constant and strong up to the end of the run. I often store the cars for a long time and they hold their power well. They charge consistantly each time even after a lot of abuse.