cheap camera batteries

[Simonnn]

Im getting my new 400d soon and looking at the accessories I need.

Whats the deal with battery makes, for an official canon battery it seems to be aroudn £45 for a 720mAh. Yet an unoffical 1000mAh seems to go for around £10 including delivery.

Are the official ones worth getting? Does anybody ahve any experience of these or any links to reviews of these batteries?

 

[Simonnn]

I think I'll go for one of the cheaper batteries, how can canon charge £35 more for something just because its got canon on it?!

 

[Simonnn]

What brand exactly were these or what does the pacaging look like? Most of the ones I've seen don't have a brand name to them