Yeah, a new battery might help in the immediate term, but replacing the battery now is no more an appropriate repair for it... than jumping the original battery is, to get it shifting so it can be moved indoors.
Weak batteries do not cause ES shifting problems, neglected and improper ES system maintenance does. Many folks wrongly assume that a new/strong battery is required every time an ES bike begins to fail... that line of crap gets repeated all across the Internet. Most folks don't understand electricity very well and even fewer of them have ever taken the time to properly prep an ES bike. So the battery is always blamed... cause a new one sometimes rewards them a few more weeks/months of shifting before something major fails.
If a battery maintains 12.6 volts or more at its resting voltage and is powerful enough to operate the starter motor and start the bike, then it is plenty capable of shifting the bike and operating a plow winch, provided that the factory ES system prep has been corrected. A weak battery will fail to crank the motor over long before it will fail to shift the trans. The battery is never a part of the problem.
I've gotten a bit hard-nosed and long winded again here... but if you notice above in my 1st post in this thread, I've also gotten tired of repeating the solution to ES issues every time a new guy shows up. I ask the owner to commit themselves beforehand now... whether they are ready to fix the problem and fix it right, or just interested in another band-aid that might allow them some continuing neglect must be learned before I'll waste any more time on them. Unfortunately most of these guys are not yet ready, they just wanna be told to go buy something that they can plug in... that magically solves every problem on the bike. :-(
I apologize for bringing y'all this rant. This needed to be cleared up though.