Canon BP-511 camera battery is a 1600mah high capacity lithium ion battery for bp-511, bp-511a replacement. Made from reliable and durable battery cells, could provide lasting and stable power to a wide range of Canon cameras well, such as Canon EOS 5D, 10D, Kiss, Canon Powershot G1/G2/G3/G5/G6. A spare Canon BP-511 Battery Pack is an essential item in the Canon EOS 10D, Canon EOS 300D Digital Rebel or Canon EOS D60 kit. The Canon BP-511 Battery Pack is a Lithium-Ion battery - as maintenance-free as the current crop of digital camera batteries get. The manual simply tells you to use them and charge them as you desire. My personal recommendation is to have at least two Canon BP-511 Battery Packs. Keep one in the camera, keep the other(s) fully charged in your bag - ready for immediate use. Giving each battery a complete discharge/charge cycle during each use cannot be bad. The BP511 is a Li-ion battery pack. The good thing about Li-ion batteries is that they don\'t suffer from the \"memory effect\" that NiCad and NiMH tend to. This means you can charge them whenever you want regardless of whether they are half full or completely empty. It\'s still not good practise to overcharge though. Li-ion batteries also generally offer longer life than other types of battery, and are less weighty as a bonus. Typically though, they tend to me more pricey - so certainly horses for courses. Canon BP-511 specification: Chemistry LI-ION Voltage 7.4V(Compatible with 7.2V) Capacity 1600mAh Dimension 55.10x38.20x21.00mm The BP511 is compatible with the following digital cameras: Powershot Series G1, G2, G3, G5, G6, Pro 90, PRO 90 IS EOS Series D1, 10D, 20D, 300D/Rebel, D30 D60 and with the following digital camcorders: MV Series X150i, X100i, XIi, X2i, 650i, 630i, 600i, 600, 450, 430i, 400i, 300i, 300, 30 ZR Series 10, 20, 25mc, 30mc, 50MC, 60, 65MC, 70 MC Optura Series 10, 100MC, 20, 200MC, Pi To confuse things slightly, the battery may also be referred to as the CANON BP-508, BP-512, BP-522 or BP-535 Pros: Most importantly, it is lot cheaper than the BP-511 and also has 1600mAh agianst 1100mAh. Fast Charging and Long Life. Cons: NO cons whatsoever. Comments: Using this in my Digital Rebel and works like a gem. Bought it for a backup but I may use the actual BP-511 as backup!! That explains... Where to buy: http://www.usa-batteries.com/digital-camera/canon-bp-511-battery.htm http://www.canon-digital-camera-battery.co.uk/batteries/canon-bp-511.htm http://www.digitalcamerabattery.ca/digital-camera-batteries/canon-bp-511.htm http://www.digital-camera-batteries.org/canon/bp-511-battery.html Consumer Electronic Review Writer u