DUAL-ion+ ReVIVE Series CANON BP-511 / BP-511a Rapid Battery Charger for Canon EOS 50D / 40D / 30D / 5D and MANY More Cameras Dual Battery Charger allows you to charge two batteries at the same time quickly and efficiently Status LED Display for Real Time Charging Progress shows when battery is at 25%, 50%, 75%, and 100% capacity When a full charge is received, Auto-cutoff enables trickle-charging to prevent damage to your battery Utilizes MPC Technology for Fast and Smart Charging. AC, DC world-ready 100-240 volt Charges either 1 or 2 Batteries! Additional interchangeable charging plates for other battery types are also available