the LED uses very little power...do you keep your battery on a maintainer...if you need a battery get the biggest AH rated in your group size...Get a AGM there are a few online battery vendors with great prices an free shipping...Deka an Odysey are good batteries....
I was going to get an interstate but found out the power sport ones are no longer made by them as told by Intersate dealer..
Your probably not going to have issues with an 850 XP running those accessories. You have 450W at idle and 550W at higher RPM plus your battery reserve. Don't talk yourself into an issue. Always better to give the stock system a chance before upgrading. At the most buy a half amp or 1 amp battery tender to keep the battery at max charge but I would just wait and see if you need it.
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