As one of its daily deals, Groupon offers 12 Duracell Stay Charged Rechargeable AAA Batteries for $13.99 plus $2.99 for shipping. That's $1.42 per battery and the lowest total price we could find for this quantity by $7. These pre-charged 800mAh AAA batteries purport to retain power for up to 365 days while not in use. Deal ends February 5.