My smittybuilt xrc8 pulls about 450 amps when fully loaded. I have to pause during pulls to let my charging system catch up with the depleted battery. During one strong/long pull it actually stalled my jeep due to the alternator locking up from the magnetic field generated by the high electrical load. I would get the strongest battery you could if your going to be winching a lot. I have a napa battery in mine, and for the most part, it's just fine.