NoPoPo water powered battery AA set, just add water
NoPoPo Water Powered Rechargeable batteries.
Designed for Emergencies as they only need water or other fluids for charging.
Available in AA size. Eye dropper used to add water to batteries.
up to 20 year shelf life. Non Toxic - Eco Friendly. Water works best.
Other fluids work in Emergencies. Tea, beer, even urine.
(yes, it says "you can use urine" in the directions)
Rated at 400-500mAh max & 1.5v and best for low power radios & LED flash lights.
When charge gets low just refill.
The number of charges depends on how batteries are used.
(maker says approx 10+ times reuse)