You mite try the DJI Power supply unit you get the unit plus 2 batter's So can have the spark and 2 battery's charging it one time.I think you are right. I'll try another cable first but may have to get another power bank.
The DJI charger is portable like your power brick but charge's 3 at a timeI would like to be able to charge on the go. We are travelling for a few months and don't always have access to mains. [emoji3]
Actually it was the cable, charging works now with a better quality cable. Silly.
Oh you mean that one. Yes that would be cool, maybe later.The DJI charger is portable like your power brick but charge's 3 at a time