Not lipo but just as good and cheaper. You could fit these
http://cgi.ebay.co.uk/8x-AA-2100mAh-...item35a6f1d0ba
They behave the same as lipo,s with a very low discharge rate. They can be charged and left for months at a time and loose minimul voltage. I know i few other racers posted that they too used these. For the price you cant go wrong.