1S and 2S typically is used to refer to 1 battery in series, or 2 batteries in series. 2S should be 6-8V while 1S is 3-4V.
Hhmm, there's some good info on here for flashing. Think the Q8 doesn't have pogo pins defined, so you'll need a programming setup. I'd start here: https://budgetlightforum.com/t/-/30672
You'll need that clip setup, same setup for the ATtiny13A.