I have a battery checker I've just charged the battery with the charger that came with my camera. My Digital multimeter gives pretty much identical readings for the newer $7.00 battery and the $40.00 (to replace) battery that came with the camera. The camera works like a charm with both. So far I am pleased.

Its not an AA. Its a li-40/42B or NP45 lithium ion camera battery. The camera manual recommends draining before storage and a full recharge before the next use.