Check out the local interstate dealer. I have been buying refurbished batteries from the one here for the last 6yrs for a Versatile 835. $100 for both batteries. First set lasted one season and then the 2nd set I am on my 4th season with. Don't do anything with them in the winter and the last few winters have forgot to unhook them. Charge them up in spring and they will run all season. Got tired of spending $400+ for new batteries that only would last a year or two at the most.