Just testing out my new Anker 757 charging pack. it was able to charge my 16 TB50 batters from 20% to 100% in about 90 minutes. Still had 16%. Enough left over to charge my iPhone, Controller for my M200 and Air 2S, My MacBook Pro. Great addition to the gear for those long days in the large Solar Fields. Don't have to worry about running out of batteries now. Will also come in handy for S&R missions.