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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.

For powerful image-making you need, well, power. Lithium Ion Batteries allow you to be certain that you won’t run out. Lithium Ion doesn’t require being fully run down to be recharged with peak performance. So no more guessing how close you are to the end of the battery, or worry about shortening the battery life by frequent recharges.

 A powerful battery is a must with digital cameras. And the Canon digital rebel requires a proprietary battery, so you cannot use AA batteries. Although expensive, the good news is you only need one spare, as these are so long lasting. And the replacement battery is cheap. You can order the replacement battery for your canon bp-511. It will also extend your run time. Now give you two referenced websites in US and UK, you can searh the battery that you need with better price:

http://www.camcorder-batteries.us/digital-camera-batteries/canon-bp-511.htm

http://www.my-battery.co.uk/digital-camera-batteries/canon-bp-511.htm