I think I should specify local, at least North American suppliers, ebay or any source with a replacement battery for the 602. I am surprised at the lack of response which is probably good news as the battery does last a long time. I use mine daily for hours. It has been to Mexico and Spain, travels very well and never froze on me. If it had a light like the Kobo Glo I would never buy another ereader. (Ah, except for ten inch for pdfs, darn!)
Someone must have have replaced the battery on the 602 (think 902 has same battery) -- there are lots similar but the contacts on the 602 are on side rather than end.