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
As @beeshyams answered, the USB Standards specify that charging voltage should be 5.00V ± 0.25V, i.e. 4.75V~5.25V.
Most cables have resistance, which lowers the actual voltage that your phone receives. A typical 1-meter long 24AWG cable eats approximately 0.5V. So some good chargers have a feature called loss compensation. These chargers raise their output voltage when a load is detected. In my case a Samsung charger (shipped with S5/Note 4) can raise output V to 5.6V at a load of 2 Amperes. It's completely safe to use the 13W charger if it doesn't exceed 5.5V. It will be faster than the regular 10W one. But if it only output power at 5.1V, the speed boost isn't quite noticeable.