Yes it’s best to stop charging it around 85% to 95% percent(for longevity reasons). I recently discovered a way how to communicate with the car to find out the percentage without turning it on.
1) Full version “Torque app” (I believe u can only download on android phones unfortunately)
2) Bluetooth ODB reader.
Deep Ocean/Earth Tri-Tone Eco-Chic VIN#1506 May Good Karma Be With U Always!