I have not heard of it in Singapore. In any case, it is better to be careful. From my source, it seems that Nokia had issued a warning that the BP-6M batteries of the N-series may balloon and cause the cover not being able to close properly. If you have one of them with this issue, you can go down to the service center for a change.
From the report, it seems that it only affect a few handsets in certain region. It seems that this 1100mah battery has the problem of ballooning after use and thus cause the problem of closing the cover properly.
Based on Nokia Website, the battery is compatible with a number of handsets. They are:-
- Nokia 3250
- Nokia 6151
- Nokia 6233
- Nokia 6234
- Nokia 6280
- Nokia 6288
- Nokia 9300
- Nokia 9300i
- Nokia N73
- Nokia N77
- Nokia N93
Click Here to see the compatibility chart.
After reading through the reports, it seems that the popular models like N73, N77 and N93 are mentioned to have the most cases.
Click Here to Read one of the Reports
Like what I have mentioned, there was no indication that Singapore has such problem with this battery. But as a precautionary measures, please take a look at your battery. If it seems to have balloon or swell in size, please check with your local representative.
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(source)