Hitech - Rechargeable Battery for Canon EOS 40D / EOS 50D SLR Digital Camera Replaces Canon BP-511 digital camera battery For Canon EOS 40D , EOS 50D SLR digital camera Li-ion rechargeable battery . Capacity: 1200Ah; Voltage: 7.4V 100% compatible and meet or exceed original specifications Item described available at Hitech merchant.