Take your tablet and phone on the road without looking back. ZEN : Ultimate compatibility Each port automatically detects your device and fine-tunes the output to charge it at maximum speed (up to 2.1A). Enjoy top charging speed with a “Zen” peace of mind Fourteen Cubic Inches of Win Some people need more capacity than our smaller batteries deliver. The A5 features five lithium-ion cells with incredibly high energy density. It’s one of our best sellers among users who have more than one power-hungry device. Packed with Features The unique charge-through function allows you to charge the external battery while it is charging your devices, a feature rarely seen in external batteries. The A-Series battery will automatically turn itself on when connected to a compatible device for charging, then switch back to standby when charging is complete. The A-Series battery can maintain up to 95% of its charge after six months without use.