Yesterday was battery day - $1100 worth.
After keeping the tractor's old battery barely alive for a few months by keeping it on a maintainer I finally got a new battery. I'm keeping a maintainer on the new one too. I never use the tractor for hours at a time and I don't think it runs long enough for the alternator to keep the battery fully charged. The new battery is a Legend model from NAPA - $145.
Next came the golf cart batteries. I don't know how old the old ones were. When I bought the cart the guy said it needed new batteries and that was 3 years ago. I did a lot of searching around for six 8 volt batteries. Batteries plus had them for $229. My corporate discount brought that down to $206. The Interstate store had them for nearly $300 EACH! NAPA lists them at $285 and nets them out at $149, so I got the NAPA Legends (rebranded Dekas). Dekas have been good for me in the past.
Golf cart batteries corrode bad, especially as the batteries get old. I coat the terminals and cables with conducting grease before I put the nuts on.
I like to grease my nuts, so they get a good coating of conducting grease after they're tightened down.