Tanga offers the Duracell AA Rechargeable 2,450mAh Battery 12-Pack for $21.99 with free shipping. That's $1.83/battery, tied with our mention from two weeks ago, and the lowest total price we could find for this quantity by $14. These pre-charged 2,450mAh AA batteries purportedly retain power for up to 365 days while not in use.