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That depends upon the battery model (type) and its associated capacity. For example, Eveready's Energizer e2 (model X22) is rated at 655mAh, while the standard Energizer alkaline (model 522) is rated at 625mAh. Their carbon-zinc equivalent (model 1222) is rated at 400mAh, and their NiMH rechargeable equivalent (model NH22) is rated at only 150mAh.