The performance of Lithium-based batteries in mobile phones is highly dependent on its usage profile among other factors such as aging, operating temperature, defects etc. Therefore, in order to estimate the life of batteries it is important to carefully observe the battery discharge profile under active phone operation. As various apps/processes draw power from these batteries in a varied manner, it can have a significant impact on the life and performance of phones. The main task in this research was to evaluate discharge profile of android based mobile phones to estimate aging process. The implementation of this task was achieved through application programme interface (API) given in the software and a relevant APK (Android Package) was designed to decipher the discharge current.