I used Eneloop batteries for wedding so far i'm happy better than my sony.My advice it only last for 200++ continuios flash and it becomes HOT this is the time to remove it and leave it COOL and us Back up.Once it cool it respond normal and after a few shots i will happen again and that the time to recharge it. For me when this happen i will take more than 2 hours to recharge with OEM SANYO charger.