I was wondering if a rechargeable flashlight, for example, the Olight SR52 rechargeable, could be used to power my smartphone in an emergency?
http://olightworld.com/product/sr52-intimidator/?bc=5
http://www.batteryjunction.com/olight-sr52-xml2.html
http://olightworld.com/product/sr52-intimidator/?bc=5
http://www.batteryjunction.com/olight-sr52-xml2.html