For standby use these are first class. Only need to recharge every six months or so.
Rechargeable Battery AA 2000mAh [SAA20B4] (4pk) Sanyo Eneloop
Rechargeable Battery AA 2000mAh @ 1.2v Ni-MH
Digital Cameras & High Drain Devices
Sanyo Eneloop rechargeable AA batteries last upto 1000 cycles
4*50 x 14.2mm dia Cells
Retains 85% of charge after 1 year
Charged ready for use