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The Canon Battery Pack LP-E8 is a Li-ion 7.2v battery with a capacity of 1120 mAh (8.1Wh). Photo below shows the Canon Battery Pack LP-E8 and it's specifications.
The battery pack has four electrical female pins. If you look at the bottom of the battery with the pins toward the top, you'll see that the left-most pin is the positive (+) pin and the right-most pin is the negative (-) pin. The two electrical contacts in the middle is not labeled.
The Canon Battery Pack LP-E8 is compatible with the following digital SLR cameras: