Hi mate, dave @ TOP models has the boosters ;-) same as this
http://www.rcracinguk.com/index.php?...oducts_id=4944
I've been running just 1 Reedy LiPo 6500mAh 3.7V 65C which lasts all night with repeaking inbetween heats, but may go to 2 so they get a proper charge due to the voltage output of the Lipo.
HTH Steve