Meritline offers the Soundlogic 5,600mAh Portable Backup Battery in Black, model no. BB56-24/5723, for $24.99. Coupon code "MLCP05EN" cuts it to $18.99. With free shipping, that's $1 under our June mention and the lowest total price we could find by $4. It charges and provides backup power to USB input-compatible devices, including iPhone, iPod, and most other current smartphones. Deal ends December 9.