ZEN+: ULTIMATE COMPATIBILITY. 10,000 mAh capacity. The A-Series battery will automatically turn itself on when connected to a compatible device for charging. The A-Series battery can maintain up to 95% of its charge after six months without use. The unique charge-through function allows you to charge the external battery while it is charging your devices,. The A3TC from Zendure includes a USB-C input/output and USB-A output for versatility and performance in a small form factor.