> After all, my phone's simple battery is basically done within 5 years It's a design parameter for the battery and its management system. Basically lithium io

> After all, my phone's simple battery is basically done within 5 years It's a design parameter for the battery and its management system. Basically lithium ion battery lifetime is a function of what you cap the charge at. If the battery design sets the "100%" point in the BMS close to the chemistry's max capacity, you will get a low number of charge cycles. Phones have a shorter design lifetime than cars and make more aggressive compromises towards lower size and weight.