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Get a 12pk of Duracell Rechargeable AA Batteries for $21.99 with free shipping at Tanga. The lowest price a 4-pack of these batteries sells for is $11.42, so you save around $12 with this deal. These 2450mAh capacity batteries can hold a charge for up to 365 days while not in use and can be recharged hundreds of times. Sales tax is not charged in most states.