The tigra mountcase power plus bike kit for iphone 66s more than doubles your phone39s run time thanks to the added 3 100 mah battery if you do happen to run out of juice a built in lightning connecter means you can charge your phone without taking it out of its case speaking of the case it39s made from shock absorbing soft thermoplastic to keep your phone safe and secure tigra mountcase power plus bike kit for iphone 66s features 3 100 mah battery more than double