We’ve all seen wind up radios and torches but what about wind up batteries for emergencies? Designer Qian Jiang has created these batteries coming in either AA or AAA sizes which require either 5 minutes of twisting to charge to 45% or 20 minutes of cranking to get to the full charge level. The design features a crank shaft that snaps neatly into the side of the battery for easy travel and would not look out of place in an emergency kit. Check out the gallery below for full details on how the rechargeable wind up battery would work.
Source: Dor Nob