The battery also supports reverse charging feature. (gadgets.ndtv.com)
The battery also has a reverse charging feature. (pocket-lint.com)
And since it's actually pretty hard to kill the ZenFone Max 4 in a single day, Asus thoughtfully included a reverse charging feature (and a cable), so you can use the phone's excess juice to recharge other devices like a camera or someone else's less resilient handset. (gizmodo.com)