Cheap Digital SLR Batteries

Nikon EN-EL3e Rechargeable Li-Ion Battery for D200, D300, D700 and D80 Digital SLR Cameras
Manufacturer Description
EN-EL3e Li-ion Rechargeable Battery for Nikon digital SLR cameras. Keeping a spare battery on hand ensures that you will always be ready to capture the images you want most. And, while Li-ion rechargeable batteries are less prone to recharge “memory,” using [...]

Sony ACC-AMFM11 Accessory Kit (Includes NP-FM500H Rechargeable Battery Pack and LCS-SC11 Case) for the Sony Alpha Digital SLR
Includes:
Sony NPFM500H Alpha Rechargeable Battery Pack
InfoLITHIUM M series battery
11.8v / 1650-mah / Infolithium technology shows remaining battery capacity in percentage read-out display
and LCS-SC11 Case