thanks guys for you time.... when i asked the qestion i only had 2 sidewinders... and castle said a 4600 with a 3 cell with the right gearing in a b4 will smoke a 5700 on a two cell... 11.4/7.4 more volts more power... but i bought a mamba max yesterday so the table turned..lol i will run my t4 with a 5700 and b4 with a 4600 3 cell with the mamba