55wh (Mavic 2 battery from 10%SOC to full) for 7 packs = 375wh. Allow 20% for buck converter losses and charging efficiency and your looking at 40Ah at 12V.
This is my SxS and I charged 7 batteries in a row for my mavic and when I started the SxS it didn’t even crank slow . It would take a lot of these little batteries to kill a full size .
That’s like leaving the headlights of for 4 hours (55w halogens).
Doesn’t seem likely.
What size battery are you running?
What % charge were the batteries charged from?
