145 mah battery cell
http://www.b-p-p.com/kokam145.htm
xi li-poly charger
http://homefly.com
Regulating them just means your wall transformer needs to be regulated. You can find them for under $10 at RadioShack. Ask one of their employees for help. It's no biggy at all. Instructions come with the xi charger from homefly.
I love this mod.
I would not recommend it in a bit/sizer unless the chassis is extended. The speed and power overwhelm even the longest of cars....so the longer the better. This mod is preferred for Zips.