I read the instructions and have played with it, reads nothing over 2000, after reading on the internet there is not a meter to read Mah, there are math formulas you can guesstimate. My thought is the Chinese are slapping 5000 MaH on a battery and knowing they are not. All I know is the 3K and 5K MaH batteries I have run a lot longer than the 2400 I started with, how much longer? I don't have the hours to check and worry about that, I just carry spares.
I like the AW brand, although I think the 3400s may be a little too long for my olite M1X with battery extender. The positive terminal is getting indented. Probably just shorten the spring or something like that? 3100s fit fine. And 3400 singles in other flashlights fit fine
It may have just been a combination of bad charger but I initially was using the ultra fire battery and the ultra fire charger and I was not able to recharge these batteries more than about two or three times and most of the time they wouldn't even fully charge. Was very frustrating.
I am now using the Pila charger with the AW battery and have multiple recharge cycles on them and I am very happy with the set up.