Volts is not power
Would be good if instead of saying 1.2 V you quoted all the information.
Once activated, a single cell provides an open circuit potential of 1.2 V and a peak power density of 150 µW/cm2 at 0.5 mA.
We developed a water-activated paper battery for single-use electronics with low environmental impact.
Life cycle assessment will also be completed to evaluate and compare the environmental impact (CO2/kWh) of our paper battery.
They can hardly say it has "low environmental impact" if they have not do done an environmental impact study!!
Paper as a surprisingly large environmental footprint and I'm not sure how well what is left after it as been used is recyclable.