I was looking at the new lineup and noticed some models with ES on the end like Assault 800 ES. These sleds are around $400 more than non ES models. What does the ES have over other models??
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I will admit I enjoy ES on my 4 stroke dirt bike, but I am loathe to rely on a battery at all with snowmobiles in the cold weather. They start so easily with EFI anyway, I don't see the big deal using the pull cord and saving 20 lbs.
I run one of these $$$$ lithium batteries in my Nytro and have had zero problems. At least with the pro you have a backup option to pullstart. I was told that pretty much the only extra weight was from the battery.
Can you point me in the direction of the battery you are using. I put one on for a buddy this winter... on a xp. The lithium was 40 more cc amps than the stock battery, and it still wouldnt turn it over. I called the company and when I said it was on a snowmobile, the guy just groaned. He said it was rated for -5, but he didnt trust that. It would only turn it over in the shop that was about 50*, take it outside @ 20* and you were out of luck.