Roystoys
There is an app called acubattery that allows you to set a charging level so when it reaches the set level it stops charging. So you simply set a level lower than the actual amount of charge your phone has and when you connect to your vehicle to use android auto it will not charge. The only downside is the lowest you can set your charge limit to on the app is 50%, but it's better than nothing.Thanks to the clever developers at acubattery
How to use wired android auto without constantly changing the phone
To my knowledge, Accubattery will only sound an alarm when charging above the set battery level. Trickle charging is least harmful at 50%. I guess the reason why we don't offer this option is because most people don't have their phone connected all the time (and we have to consider most people). It's less harmful to start at 80% if you want to use your phone for 1 day compared to 50% since you will most likely end up with charging your phone from a very low battery level.
