- Zendure: Originated from one of the most successful external battery projects on Kickstarter. Trusted by hundreds of thousands of fans worldwide. Join the Zendure experience today. Durability & Style: Crush proof composite material, dual-injection molding make it one of the most durable and yet stylish external batteries available. In addition, the portable charger can maintain up to 95% of charge after six months in standby (when USB disconnected). A great feature for emergency backup. Unique Charge-Through (a.k.a. pass-through charging) Feature: You can charge Zendure while charging your devices with a single wall charger, a feature rarely seen in other power banks. ZEN+: Ultimate compatibility. The USB Ports automatically detects your device and fine tunes the output to charge it at maximum speed (up to 1A). The power bank will turn itself on automatically when connected to compatible devices so you don't need to push the power button on the external battery. Enjoy top charging speed with a "Zen" peace of mind.