Can I use a 5.1V powerbank on my iphone 5s?
SO I have this asus zenPower powerbank, it has 5.1V=2.4A output. Is it safe to use it in my iPhone 5s won't it break my phone or The batter?
iPhone 5s, iOS 9.3.4
Yes, it should work fine, however it is still not recommend.
The only thing that concerns me is the 2.4A when apples charger is only 1A.
So I recommend against it, but using it once should not kill the device.