[QUOTE=Doraemon;219816]the funny thing is:

whenever im charging the stock battery with the device turned off, the little battery charging icon does appear on the scrren but this thing turns itself on automatically after few seconds of charging and kept rebooting b/c the OS wouldn't load up.

So when charger gets plugged in, the unit starts booting on it's own *without pressing any buttons* on the n810?
If so, this has been reported at https://bugs.maemo.org/show_bug.cgi?id=3555 . Can you please add a comment to that bug report that this problem also happens to you? According to that report reflashing might help, there's also the request to provide a coredump (though both might be hard if the device shuts down after a few seconds).
Thanks!