

Hah, I did exactly the same. Mine arrived with a broken fan, but it didn’t matter because it never kicked in anyway. I used it as a Gameboy emulator for quite a while, it was actually small enough to hold like a handheld with QWAS acting as a Dpad.
Learning how to type with that tiny keyboard was a fun challenge.






Technically it should be possible to get to 80-90% at full charging power, assuming the car/battery and charger are properly designed (read: cooled) - most are not, so the charging quickly slows down to prevent overheating.
After that lithium charging (should) transition from Constant Current to Constant Voltage charging, which slowly tapers down to zero, and it usually takes forever to finish.