Battery charger

[fabrizio cicconi]

Hallo,
I've DF+ and is my surprise that in the last time I use battery Alkaline AA and the camera finish to shot When the batteries are still charged.
I use the batteri PO 645Li-Ion 2000mAh too and is the same.
the big problems that some times the camera The camera goes into block, and it is impossible to restart it even by changing the batteries or use the battery grip...
Inly after 2 hours of stop, restart with new battery.
Has anybody have the same problem or some advice?
My best
Fabrizio