6210 upgrade to 6250 not charging

Hi there everybody,

I upgraded my 6210 to 6250 and its work, except for one problem.I dont know what happen to that pon coz when its not upgraded its working ferfect. Charging ok signal is good no problem at all. But now the pon didnt charge by itself. When you put charger to that pon you can see the charging indecator bar going up in down indecating that the pon is charging. After an hour i check it and the battery is emty. I buy a new one thinking that the battery is not working or dead but it also the same the other one. Its very clear that the problem is not the battery.
Can anybody know where the problem come. Its only happen when its upgraded to 6250. Any suggestion i must be appreciated.

Thanks and advance.........