Powering Mobile via newegg offers the Cellevo 13,500 mAh Universal Portable Battery, model no. YP13500, for $34.99 with free shipping. That's $65 off list and tied with last week's mention as the lowest total price we've seen for a 13,500 mAh battery this year. It's compatible with Apple iPad / iPhone, Samsung Galaxy S, tablets, laptops, and smartphones.