Cant remember it's exact name right now, but I mean that adapter from the old Nokia chargers to the mini-usb plug used by the N900.
Anyway, for those who use it, have you noticed that after a while the adapter gets pretty hot and start making weird noises? I actually woke up once and had to plug it out since I couldn't sleep with it plugged in. I'm using the charger supplied with my Nokia E71(its a really small charger, and I think its boosted since the E71 charges extremely quick).
Oh wow. I have a small Game Boy Advance SP model made of some kind of metal, I put it on it and then close the screen, it usually cool down pretty good. Anyway thank you for enlightening me, I will now stop using it at once. It's a shame really, the E71 travel charger have the perfect size.
There is one app that save a graph with the battery charging time etc etc..I don't remember the name....
When I find that I'll try to install it and see if I can check if it is really charging for so many hours or if stops and start again..