Re: Just bought a 1991 2150zc
 

I don't really have a battery recommendation for you. I use to buy the most expensive ones I could afford until my dads Everstarts (from Walmart) were outlasting my batteries- optimas. He uses 3 everstarts in his bass boat. If maintained correctly they last years and are under $100 each. I can't comment on what kinda performance there is between the two brands. I cant say I noticed anything betweem the everstart over the more expensive batteries aside from more $$$ in my pocket. I flip a switch or turn a key and I have power so they work for me!
If you are looking for an isolator I have a brand new one I'll sell you for 100$+ shipping. I am putting one in my Shabah when the shrink wrap comes off an the other was for a buddies Crownline but he is now selling. Its the Add-a-battery 7650

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Re: Just bought a 1991 2150zc
 

I did quite a bit of research last Winter on batteries. It seems to be like the old guys say about tires, "There's really only about three companies that make 'em all." Personally, I don't think that means each manufacturer can't produce varying levels of quality but I do think it's nice to have some insight. I ended up going with AutoCraft because you can get such good deals at Advanced Auto by using promo codes from retailmenot. After a $40 discount, I got a set (group 27 and group 24) for $136.98 before tax at the beginning of the 2013 season.

Delphi:
--AC-Delco
--some EverStart (WalMart)

Excide:
--Champion
--Excide
--Napa
--some EverStart (WalMart)

Johnson Controls:
--DieHard (Sears)
--Duralast (AutoZone)
--Interstate
--Kirkland (CostCo)
--Motorcraft (Ford)
--some EverStart (Walmart)
--Optima
--EverStart
--Duralast
--Energizer
--Alliance
--Autocraft
--Acura
--DieHard
--Mitsubishi
--TrueStart
--Mazda
--Kirkland Signature
--Honda

Re: Just bought a 1991 2150zc
 

I use interstate they are the best I think. Not really expensive either.