Canon EOS 40D Digital Camera Battery Lithium-Ion (1500 mAh) - Replacement for Canon BP-511 Battery Replacement battery for the Canon BP511, Lithium-Ion (Li-ion) 7.4V (1500mAh) This Synergy Digital battery is fully compatible with the original Canon BP511 Battery. You can rest assured that this battery will work with your Canon Camera/Camcorders that use BP511 and it can be charged with the original manufacturers charger. We use only high quality Japanese cells, so you are sure this battery will last for years to come. Synergy Digital is a very high reputable company that manufactures batteries and other electronic accessories for over 2 decades, all our products come with a 3 year manufacturer warranty.