why i have to reset time and date??????/

[MrLazy]

I'm using nokia 6510 now.The problem of my mobile phone is i have to reset both the time and date once i remove the battery(even though only for few seconds).Who could please tell me which component of my mobile phone need to be repaired.Thanks... ...

[Medz]

Try the battery backup under the power switch.

[MrLazy]

i tried the above method b4...but the problem still exit lala^^^any other good suggestions to KO that problem ))