Do extended life phone batteries work? They do, and might just be the solution to extend phone battery life on your Android device. Below you will find some of the longest lasting extended cell phone batteries on the market. We carry Extended Life Battery for Samsung devices including Note 2, 3, and 4 as well as the Samsung Galaxy S Series including the S3, S4, and S5. We also carry extended runtime batteries for LG phones including the G3, LG G4, LG V10 and V20. You will see up to a 100% increase in your mobile phone battery life with our high capacity extended batteries.