ok well i think ill get the 12V drills as i will be able to buy 4 of them http://www.maplin.co.uk/Module.aspx?ModuleNo=37950&TabID=1&source=15&World ID=&doy=8m3http://www.maplin.co.uk/Module.aspx?...15&WorldID=&do y=8m3

Ive just thought though, for speed controllers, will i need 4 electronize controllers for 4 motors ! Is there not a cheaper way ?

Also for batteries, should i connect all the batteries in parallel and they will just last much longer ?