Make the battery removable, then you have an off-switch and a repairable device. For bonus points, use a battery in a standardized form factor so I can buy spares.
I know, I know, the industry doesn't want me to keep my device working longer than the lifespan of a Li-ion cell.
I know, I know, the industry doesn't want me to keep my device working longer than the lifespan of a Li-ion cell.