What do you NEED to know? Are you looking for what fits you E10? How much are you willing to spend? Do you have any idea of what you want? Are there any links to lipos/chargers you've been looking at? Posting a half as$ question like that isn't giving us much to go on. Plus you'll get no responces. Look on Ebay for lipos. Do a search on 4000mah 2S 15C lipos. You should have no problems with one of them dropping right in. Bought two 4000mah 2S Lipos on ebay, from Hong Kong shipped for $40. Here is a link. But remember, you WILL need a LIPO charger for them. Do you have a basic understand of Lipos?

http://cgi.ebay.com/2x-EC-POWER-4000...713.m153.l1262