These prototype solar powered rechargeable batteries called SunCats is designed by Knut Karlsen, is a set of old NiMH rechargeable batteries wrapped in a flexible Photo Voltaic cell created by the Institute for Energy Technology. When low-batt just leave them exposed to sunlight and they will recharge themselves. The PV cells were glued on the battery and wired up using a conductive silver pen and some flat wires found from a broken canon lens. It is still weak in charging at the moment but Knot envisions that a second version with built-in capacitors and electronics will make the charging more efficient. For more pictures
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[via Ohgizmo]