Battery
Le Mans Master
Joined: Feb 2003
Posts: 6,683
Likes: 144
From: Memphis Tennessee
When not driving for a few days, always put a "battery tender" on her. There is quite a bit of parasitic-draw with these rides and keeping the battery topped off with significantly extend the life. I got just short of 10 years (119 months) from my OE cell.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,662
Likes: 4,093
From: Cape Coral, Florida
I’d go with the AC Delco 78PSHR (Professional Silver High Reserve) battery with a whopping 140 minute RC (Reserve Capacity)…you should also replace both battery bolts since they have a special conductive coating which helps in transfer of energy between the battery and the terminals…part number for side post batteries is 19115561.
Last edited by C5 Diag; Nov 5, 2022 at 10:12 AM.
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I used AGM batteries in my last two C5s and they provided great service for many years.
Race Director
Joined: May 2003
Posts: 14,137
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From: Iowa
St. Jude Donor '03 thru '26
Like many have said, AGM is the way to go as they won't leak acid onto the C5's computer. I personally use the Optima Yellow Top and a battery tender. I also have Red Tops as one came with the car and the other for cosmetic reasons 
https://www.optimabatteries.com/prod...lowtop-d34-78/
https://www.optimabatteries.com/prod...lowtop-d34-78/
Burning Brakes
Joined: Jan 2011
Posts: 779
Likes: 67
From: Simi Valley Ca
St. Jude Donor '12
After reading this from their site, is there a reason not to get the red version?
"Use REDTOP for normal engine starting where an alternator immediately monitors the state of charge and provides energy to the battery whenever it is needed.
This would describe most stock vehicles, including: automotive and RV under hood starting, heavy equipment where starting is the primary function, and diesel vehicles without aftermarket electronics.
Use YELLOWTOP when electrical loads are higher than average, or when the discharge cycle is more than typical engine starting, such as vehicles with multiple electronic accessories and vehicles without alternators. This can also include vehicle with a lot of factory electronics such as power sliding doors and a DVD player. Examples also include: racing vehicles without a charging system, dedicated drag racers, diesel-powered vehicles with aftermarket electronics, and vehicles with inverters, winches, underdrive pulleys or other accessories."
"Use REDTOP for normal engine starting where an alternator immediately monitors the state of charge and provides energy to the battery whenever it is needed.
This would describe most stock vehicles, including: automotive and RV under hood starting, heavy equipment where starting is the primary function, and diesel vehicles without aftermarket electronics.
Use YELLOWTOP when electrical loads are higher than average, or when the discharge cycle is more than typical engine starting, such as vehicles with multiple electronic accessories and vehicles without alternators. This can also include vehicle with a lot of factory electronics such as power sliding doors and a DVD player. Examples also include: racing vehicles without a charging system, dedicated drag racers, diesel-powered vehicles with aftermarket electronics, and vehicles with inverters, winches, underdrive pulleys or other accessories."
Drifting
Joined: Sep 2017
Posts: 1,968
Likes: 697
From: Avon Lake OH
I have been very happy with my Autocraft (Johnson Controls) group 78 AGM battery 740 CCA 115 min 60 Ahr, that I bought at Advance Auto.
Some may insist on a 120 min rated AGM battery, so those would include;
Rural King (Exide) #RK-AGM78 group 78 AMG battery 770 CCA 120 min 60 Ahr
Deka/East Penn 9A78 Intimidator group 78 AGM battery 775 CCA 120 min 55 Ahr
Some may insist on a 120 min rated AGM battery, so those would include;
Rural King (Exide) #RK-AGM78 group 78 AMG battery 770 CCA 120 min 60 Ahr
Deka/East Penn 9A78 Intimidator group 78 AGM battery 775 CCA 120 min 55 Ahr
Race Director
Joined: May 2003
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From: Iowa
St. Jude Donor '03 thru '26
After reading this from their site, is there a reason not to get the red version?
"Use REDTOP for normal engine starting where an alternator immediately monitors the state of charge and provides energy to the battery whenever it is needed.
This would describe most stock vehicles, including: automotive and RV under hood starting, heavy equipment where starting is the primary function, and diesel vehicles without aftermarket electronics.
Use YELLOWTOP when electrical loads are higher than average, or when the discharge cycle is more than typical engine starting, such as vehicles with multiple electronic accessories and vehicles without alternators. This can also include vehicle with a lot of factory electronics such as power sliding doors and a DVD player. Examples also include: racing vehicles without a charging system, dedicated drag racers, diesel-powered vehicles with aftermarket electronics, and vehicles with inverters, winches, underdrive pulleys or other accessories."
"Use REDTOP for normal engine starting where an alternator immediately monitors the state of charge and provides energy to the battery whenever it is needed.
This would describe most stock vehicles, including: automotive and RV under hood starting, heavy equipment where starting is the primary function, and diesel vehicles without aftermarket electronics.
Use YELLOWTOP when electrical loads are higher than average, or when the discharge cycle is more than typical engine starting, such as vehicles with multiple electronic accessories and vehicles without alternators. This can also include vehicle with a lot of factory electronics such as power sliding doors and a DVD player. Examples also include: racing vehicles without a charging system, dedicated drag racers, diesel-powered vehicles with aftermarket electronics, and vehicles with inverters, winches, underdrive pulleys or other accessories."
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