I ordered an additional phone charger for my K800i and won a bid with Smarties1811. It arrived promptly, and I checked it straight away and it was working fine. When I tried it again a few weeks later, it seemed to have developed a loose connection, and might only work (for a while) if you keep trying different positions and can hold it there exactly!
I tried to contact the seller Smarties1811 on the 22 Sept when I got back off holiday, and again on the 4 Oct, with no reply. Looking at his feedback, this seems to be a common theme when things go wrong. How are you supposed to avail yourself of the promised 12 month's warranty, when no-one will answer your messages????
Moral of the story: Be careful who you buy from. Don't be fooled by cheap prices!