Using Official Raspberry Pi Power Supply to charge phone? I have a Moto G 3rd Gen, and my phone charger broke. I have both the raspberry pi official 10W power supply and the raspberry pi official 13W power supply. Can I use either or both of them to charge my moto g 3rd gen?
USB standards specify 5V plus / minus 0.25 V which is supplied by pi 10W supply whereas 13 W supply is 5.1 V which is not recommended

So you can use the 10W power supply

Thanks to Ghanima in comments
 , who pointed out something I overlooked


  The 13W supply is listed as 5.1 V with a 2% line regulation (that would be 5.1 V plus/minus 0.1 V) which puts it well within the USB spec 


So you can use both chargers safely, as pointed out in other answer giving additional reasons. Sorry for missing this detail