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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 are not labeled. Therefore, we are not clear of their purpose.
The Canon Battery Pack LP-E8 is compatible with the following digital SLR cameras:
The Canon Battery Charger LC-E8E comes with the Canon EOS Rebel T3i to charge the Canon Battery Pack LP-E8. This battery charger has four male pins. However, the two middle pins are also not labeled.
The charger charges the battery at 8.4v and 0.72A. (See photo above.)