We now live in a time where we have battery powered warfare. Our radios, optics, lights, lasers, night vision, and so many more items run off batteries.
A few years back, a couple of hand made modified SOPMOD stocks were made with the ability to recharge batteries by using solar panels mounted on the stock. While this didn’t catch on, it is an interesting bit of technology. The Blog NoMoreNakedRoofs.com which discusses solar power, wrote a short article about my recharging stock made by Tom Lyons.