[jarel]

From the paper: "Throughout the test, the Arm Cortex-M0+ processor drew an average current from the compact Al-BPV of 1.4 ± 0.4 µA with a voltage of 0.72 ± 0.14 V".

[rcxdude]

So a grand total of 31J of energy over the course of a year, or about 1% of the energy in a typical coin cell.

[IshKebab]

Yeah but think how much algae there is in the sea! With only a few million dollars of investment we might be able to power a whole house, or at least a large shed.