Recently, Xiaomi had released several different battery case for xiaomi mi4, which including Acerbity, Apricot, Bamboo, Latte, Oak and Walnut, and it had been listed on Vifocal, the price is only $15.99 usd. Anyone who wants to buy a xiaomi mi4 battery case could have a look, those battery cases look pretty good.

Xiaomi mi4 Solid Wood Plastic Back Cover: Solid Wood Plastic Back Cover Battery Case For xiaomi Mi4 Smartphone