Until September 5 at 9 pm ET, Pennywise again offers the Duracell Powerhouse USB 2.0 / mini-USB Device Charger for $15.99. Coupon code "dealnews1" cuts it to $14.99. With 1-cent shipping, that ties our July mention and is the lowest total price we could find by $6. It features a 2,000mAh external battery and can power two devices at once (via USB and mini-USB) with up to 60 hours of backup power.