I'll agree wholeheartly on the voltage bit....
a simple example using some rechargable batteries....those alkaline batteries in a digital camera they were getting old...I checked
them after charging about 1.6 for each that would be a total of 6.4, the camera operates on
at least something like 4.8 ....okay 6.4 should be plenty but yet it would just start to work then go off...checked voltage...still about 1.6
each ...but yet the other Nmhd rechargables with
only 1.3 each would work the camera just fine...
so I imagine the alkaline rechargable ones just
didn't have enough amps...as soon as they were
hooked to a load the voltage dropped to zilch...
took a while for me to figure that one out....
( :>) Norm.