sudomod

Hi, I bought this adafruit battery charger: Now I'm wondering: There's a JST connector labelled "Load". What does this do? Is this where I put my Pi etc.?
Something like the battery "payload"?

PS: Charging two batteries at once isn't a problem right?

Yes, load on the battery is whatever you connect which draws power. It's possible to charge multiple batteries safely if it's done correctly. Adafruit has a good article on it.
https://learn.adafruit.com/multi-cell-l ... g/overview