Does anyone know if it is possible (even in a very slow way) to charge the CristalSky battery via one of the USB ports? I do not think it's too difficult to implement!

Hi Monkey6, for the battery charging, you may refer to the user manual: https://dl.djicdn.com/downloads/CrystalSky/20180830/Crystalsky_User_Guide_Multi.pdf

NO, there are 2 batteries in the CS.

The detachable one that you externally need to charge that powers the screen, and in internal one that records settings. The USB port may keep the settings battery topped up. But you NEED to charge the larger one that powers the screen,

I think I did not express myself well.
I was wondering if it is correct that, to charge the battery (or the batteries, in the case of the 7.85 "version), I am obliged to buy a charger of another drone, since I own a Mavik 2 pro: it was no more easy to enable a slow charge from a USB port of those of the CS?

Monkey6 Posted at 12-4 03:02
I think I did not express myself well.
I was wondering if it is correct that, to charge the battery (or the batteries, in the case of the 7.85 "version), I am obliged to buy a charger of another drone, since I own a Mavik 2 pro: it was no more easy to enable a slow charge from a USB port of those of the CS?

nah you cant slow charge the CS via usb youre gunna need to buy a charger.