Ok a little info.
This is on my T Maxx and it is a homemade RX pack (hump pack) and it is made out of 5 AA 2500 energizers batteries.
Here is a little update I took apart the 2500 pack checked all cells they all tests 1.25+ volts. Put back together and now charging at .2 and up to 1910 mah's and going up. So for some reason they are charging better. The 1850 mah pack charged to 1900+ at .2 amps so it seems ok.