PSA: TRMNL OG charging time is longer than you think
Should anyone care - or have forgotten to read the manual - the green light doesn’t mean it’s charged. It means it’s successfully charging.
Using a USB monitor, from “please recharge” to full, it takes 6 hours 45 minutes. The unit only pulls 500mA so it’s slow. But you’ll see the green light appear and you’ll think it’s charged - it isn’t; it is still taking a charge for a long time to come.
Total charge that went in was 2700 mAh which looks about right for this unit (apparently a 2500 mAh battery).
The maths would suggest that it should take at least five hours to charge, given the unit’s 500mAh charge cap, so this all looks about right.
Anyway - the point is that it’ll take more than six hours to charge which you may feel is quite a lot slower than you expect.