Tanga offers the Duracell AAA Rechargeable Stay Charged Battery 8-Pack, model no. DX2400, for $12.99 with free shipping. At $1.62 per battery, that's a buck under our mention from three days ago and the lowest total price we could find for this quantity by $13, although last week we saw a 12-pack for only $2 more. These pre-charged 800mAh AAA batteries purportedly retain power for up to a year while not in use.