Here’s a cool idea from designer Weng Jie. It’s a camera strap with built in solar panels to generate charge for your camera. We’ve already seen many back packs include solar panels to charge phones. The strap is a concept at the moment but with the right wire could plug straight into your camera charges as you walk along.
It’s certainly a product that could work, it would save you having to carry around spare batteries and you’ll be more willing to take more pictures, not having to be concerned with battery life.