Amazon has the Anker PowerCore 13000 Portable Battery Charger for $21.24 (39.99 – 18.76 instant savings) for a limited time. Shipping is Free for Prime Members or pad your order to $49 or more and score Free Super Saver Shipping.

This compact super-high-capacity portable charger features PowerIQ to ensure intelligent high-speed charging for all your devices and VoltageBoost to prevent cable resistance from slowing your charging speeds. There’s also has a multiProtect safety system like surge protection, short circuit protection and more advanced safety features to keep you and your devices safe.