Oh, by the way, for those who are interested; I haven't yet tried to do any in-depth analysis of the Polarcell battery, but I can state that it is holding a charge just as well as my authentic genuine Nokia BL5J. I have not been putting a lot of stress on either of my N900s lately, so I can't say how quickly either battery drains under significant load, but they can both hold a charge a whole lot longer than the cheap-o fake "genuine Nokia" battery I was using before. I'm quite happy with the purchase.