Siemens A50

From Kenya, 1 post

I have this fone, siemens A50 that i bought 2 yrs ago. of late it has experienced charge retention problems.i took it to a technician who said it was a software problem and went on to change some figures in memory. the problem is now even worse.could anybody have a solution or an idea of how to go about this.Nb: the battery is new