Data lost problem after remove the battery from Phone?

Hi Everybody ;

I create the program that create default data and save the data with CDictionaryStore class.
Update with new data and I can retrieve even switch off and on back again(still can open and read updated data with external application).
But the data is lost when i take out the battery from phone around 2 minutes (My phone is 7610 - OS 7) .
And that time I need to set the date/time and the data are become default data..
I tested the code in OS 9 and it never lost the data..

Anyone got these type of problem before ?

Any Idea ?

Thks
MM Boy