I use Interstate golf cart batteries (wet cell topped off with mineral oil).

Engine/ Chassis or house batteries. You should have 2 sets or 2 batteries. For the Chassis engine starting side, you should replace wit the same size and CCA. For the house batteries 6-volt golf cart batteries will last the longest and give the best performance.

thanks for the info. does any brand stand out for performance and durability? what's your opinion on optima agm batteries. pros and cons on getting golf cart batteries vs. agms?

For the engine start batteries there isn't much difference in brands. For the house, Optima is overpriced for what they deliver. The boating crowd love them because they can brag about how much they cost. We are using Costco 6V golf cart batteries. Their actually Interstates.

thanks. are trojan batteries worth the extra cost vs. interstate?