For people that have to pay for their batteries probably, but I doubt that any of the big names (in TC) will be using them, thats not to say there havent been, but the IB's have won pretty much every race and class in TC the last couple years, if it ain't broke don't fix it. I will probably be picking up at least 3 EP packs for TC, then I will use my IB's for 1/12th, but once I get my Team Checkpoint TC1030 I will probably be running Lipos at my club