Hi, I own a SunFounder Pico-4wd-v2 which is great fun.
I haven’t used it in a while and when I picked it up again the other day, it doesn’t seem to hold charge anymore: if I charge it the led stays constant red even after few hours, and if I turn it on and command it from the app, it turns on but as soon as I send any power to the motors it turns off immediately.
My first guess would be the batteries are dead. If that’s the case how can I get a new pair?