Tag power USBC power banko

Has anyone ever used one of these power banks
to charge Mavic air batterys it has a UK 3 pin socket on the top

Got a link?

https://www.amazon.co.uk/gp/aw/d/B01M9IZHA3/ref=psdcmw_329078031_t2_B07C1L335S

Not used one personally mate.

Going by specs alone ,you will get around an hour charge time with the 50w air charger.

Few of the reviews saying it will charge a spark or Mavic.

No mention of if it’s square or modified sine wave either.

I was thinking about a portable solution few months back. The 12v DC to 220v AC and back down to 12V DC is quite inefficient, especially if the inverter is a square wave type. You lose a lot of capacity to losses in the transformer.

My thinking was that a high capacity 12v powerbank or Lion golf cart battery might be better and paired with the DJI car charger.

Edit - maybe not. The dji car charger has low voltage protection so you can start the car, probably wouldn’t work well unless you had a steady voltage throughout the discharge.