Anker Direct through Walmart has its Anker PowerCore Edge 20,000mAh Portable Battery Bank, model no. AK-A1283041, for $34.99 (regularly $44.99) with Free Shipping for a limited time. Amazon also has it for the same price but shipping is Free for Prime Members or pad your order to $49 or more and score Free Super Saver Shipping.

The powerCore Edge features a 20000mAh ultra-high capacity, which can charge your phone up to seven times over. It also provides a complete charge to even the most power-hungry tablets. It has a slimline design at just over a centimeter thick and can slip unnoticed into any bag or briefcase. It’s the perfect portable charger for travel. Anker’s exclusive PowerIQ and VoltageBoost combine in both USB ports to deliver high speed charging for any device.