Not original battery - Be careful
I bought the N-Gage Lithium-Ion battery a few weeks ago, and my old battery keeps more charge than the one this seller had sent. First of all it comes lose and not as shown in the picture. I am pretty sure that this is not a new battery. If you want to be sure you get a new battery, buy from a well known cellphone accessories site.
replacement battery for 3650, 6600, 7600 too
this is an exactly replacement battery for nokia 60 series phones (3650, 6600, 7600) but costs 20 bucks less from nokiausa.com, or 10 bucks less from local AT&T store excellent value!