it is actually charging. i just put back on my n900 and it is allready at 33% charge so even when nothing is shown the battery charges.

Why is it bad to let the battery die out? It shouldn't be bad because it can always happen.

I also dont buy 3rd party batteries. why not? because last time i had one in my n95 it became twice as big making my battery cover pop of the back of my phone. Luckily i just had to buy a new back cover. who knows what could have happend if it was in my phone a few hours longer.

3rd party batteries are absolutely not safe! there is a reason that they are cheap! you can count on that!