My yamaha dealer told me it was a waste of $$. The main battery can run anything they've had units in with 2 winches , light bars, stereos, heated seats etc . He told me don't waste your money on it.I was thinking that. I have all the same on my Grizz, but this will have more lights, heated seats and a stereo. Probably just make sure the stereo doesn't run while off much. Thanks.