High-capacity Battery Pack BP-511A (rechargeable lithium-ion battery) for EOS digital SLR & Powershot G models as well as select Canon camcorders. Compatible with: Canon Digital SLR: EOS 20D, 10D, 30D, 40D, 50D & the 5D (not suitable for the 5d MK II) Canon Power Shot: Pro 90 IS, Pro 1, G1, G2, G3, G5, G6 Canon Camcorders: Optura Pi, ZR10, ZR20mc, ZR25mc, ZR30mc, ZR40, ZR45mc, ZR50mc When used with camcorders, the BP-511A gives you a maximum recording time of 2 1/2 hours using the viewfinder, or 2 hours using the LCD screen. When used with the EOS D-series cameras, the battery is capable of Approx. 300 shots on a single charge. Use with CB-5L battery charger, sold separately.