power management shield that makes long-term batter powered Arduino possible

This shield lets an Arduino turn itself (and any shields) entirely off, and get turned on again after a set amount of time passes or when an external signal is received. This lets Arduino run for years on a small battery for monitoring and control applications.

It can also monitor battery voltage and control an independent external load.

Full manual and buy link: https://brittonkerin.com/power_manager/