do you already have a charger?
I've got a peak power 4800mah pack I'll sell for 90 shipped...I bout 4 thinking I'd need spares but they run for almost 40 mins in my TC4 so I think 3 will do me for now...I get bored driving it before the battery runs out....this pack is about 9 months old but I have only run 3 charges on it... http://www.southeastrc.com/Items/StdItemView.aspx?lookup=PEK43300
that's the pack specs...hard case and stickers still look new and I can post a pic if you're interested.....I believe these packs meet the new ROAR race requirements too....