Individual Cell Internal Impedance 20.0mΩ

All AA size cells over 1700mah should not be fast charged ever! If you repeat this experiment, your on your own. I recommend only factory wall wart charging with units rated of 70mah or less for these type cells.

Break in (first forming charge) on 50mah factory wall charger 700mah-19.6 hours,1100-30.8 hours,1650-46.2 hours, 2500-70 hours. For 70mah wall charger deduct 28% of time, for 100mah wall charger deduct 50% of time. Forming charge (initial charge) on peak detection chargers is not recommended and voids warranty.

Any peak or fast charger use on this pack voids warranty. Don't bother calling trying to get a warranty for failing to follow instructions. I've heard all the stories. They all end like this, "My battery does not cycle well now." and "It worked ok for a while but now it runs down fast shortly after charging". If you put any AA cell over 1700mah capacity on your peak charger, it's bad. I've already made theses tests for you so you could avoid the pain. If you ruin one of these mega capacity TX packs, just order a new one and do better the second time.