Battery life duration on mobile phones depend on usage and various other things you must take into account before thinking you have a faulty battery. For a better battery life, we suggest that you turn off your wifi when it is not used, close background applications, turn down screen brightness, turn off location sharing and turn off screen when it is not being used.  We are given all the technical specifications by our suppliers and we endeavour to list as much information as possible to help you make your purchase decision. Although our in-house team are keen followers of electronics, IT & consumer goods, we may not always have the expertise to answer very detailed and technical questions we get asked by our buyers. If we do have the information you required , we will respond as soon as possible. Otherwise, may we suggest websites that provide technical information on a wide range of products which will better assist your purchase decision. You may try www.google.com