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Discussion Starter #1
Looks like I need a new battery.
What is the correct battery size/class for a 1987 Quad?
 

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Trained (ex)Professional, , 1953-2018 RIP,
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Battery size is a Group 24. I'd also recommend a battery with at least a 500 CCA rating (Cold Cranking Amps).
 

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I just installed an Optima yellow top battery in my 88 quad. It is 750 cold cranking amps, 850 cranking amps, 120 minute reserve. Guaranteed for 3 years, and the cost was $214.00. Part number YEL 34/78. Stays charged very well in a car which is pretty much in winter storage just now. If you have a military ID you can buy from O'Reilly Auto Parts with a 10% discount.
 

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+1 with Optima. Our 1964 Porsche 356sc had the basic 6 volt Optima when we bought her in 2003, still cranks fine, 12 years later.
 

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Discussion Starter #6
Battery

Thought I would report back that I bought a Energizer Max battery from Sam's Club.
Group 24F, 850 cranking amps, 700 cold cranking amps, 3 year warranty for 99.95.
Compared to all the local auto parts stores this was a great price.
 

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Trained (ex)Professional, , 1953-2018 RIP,
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Plenty of power in that battery!

The difference between a Group 24 and a 24F (originally a Ford application hence the letter F) is that the positive and negative battery terminals are reversed. All other specs are the same.
 
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