Introducing the tigra power plus pack for samsung galaxy s3s4 this is the do it your self kit to convert a bike console from samsung galaxy s3 and the s4 into a rechargeable case this is designed to let you charge your phone whilst riding with a s800mah power pack while having full protection against rain and shock inside the case in which the phone sits as you are aware if you ride with your phone as a gps realistically you dont have much battery life before the phones is completely flat