Get a Viper winch from Motoalliance (one of our sponsors). I'd go with at least a 4000#, or upgrade to the 4500# or 5000#. I've had the 5k on my RZR4 for 3 years and it has served me well.
That's odd. I've got the same winch and single stock battery but have never had any issues......and have used it NUMEROUS times.I would watch out with the 5k viper. That's what I run and on my 500 it would literally drain the battery as soon as I hit the button. I had to upgrade to a large automotive agm battery in order to run the winch. I don't know if your 400 has the same size stator as the 500 so I'd be careful