Charging OP-1 off of iPad charger: ok?

This may be a dumb question but I’m doing a cross country train trip soon and may have room to bring the OP-1 along. I’ve only ever charged it off of my Mac. Basically: there’s no problems charging it off of a 10W iPad USB charger, right?

Yep, alot of us use the ipad chargers. People claim that it’s faster than charging it with your comp.