faggetaboudit 
the optima redtop group 75 is 33lbs... 20 lbs is a lot!
Need a new battery
Le Mans Master
Joined: Sep 2001
Posts: 5,022
Likes: 1
From: TEXAS
However, if you search the battery threads, many 2001-2003 C5's guys are using group 78 batteries instead of group 75. The 78's batteries fit in the C5's and provide more reserve
Le Mans Master
Joined: Sep 2001
Posts: 5,022
Likes: 1
From: TEXAS
Tech Contributor
Joined: Jan 2004
Posts: 20,030
Likes: 289
From: Wylie TX --> Less is More, except under the hood !
Just picked up this one last weekend. Luckily it was on special from what it's selling for now.
Die Hard Platinum P4
http://www.sears.com/diehard-platinu...2&AID=11042411
Die Hard Platinum P4
http://www.sears.com/diehard-platinu...2&AID=11042411
RC = 135
Le Mans Master
Joined: Nov 2006
Posts: 7,215
Likes: 1
From: Orlando FL
Here is the information I got off Interstate batteries web site. the number for the battery is the "Group Size", sizes are universal between manufaturs.. Ex: 78=Group 78, 75=Group 75
Battery Sizes and option Per Interstate Battery Site: Most likely can be mixed between the years.. size looks to be about the same, some have more CCA then others and they do have a AGM. The Number is the "Battery Group" (Size). My guess is that you can swap in a larger batter with little to no work. I would Recommend a good AGM battery, they dont leak acid if they crack or fail like a normal battery. I like interstate myself but there are others that are good. From what i remember i think you can put a Group 78 in place of a 75 amd vice versa.
Battery sizes stock for C5 Corvette's by year:
2004 MTP-86 640CCA
2003 MTP-75 700CCA
2002 MTP-75 700CCA
2001 MTP-75 700CCA
2000 MTP-78 800CCA -Alternate/Optional MT-75 700CCA
2000 MT7-78 800CCA -AGM
1999 MTP-78 800CCA -Alternate/Optional MT-75 700CCA
1999 MT7-78 800CCA -AGM
1998 MTP-78 800CCA -Alternate/Optional MT-75 700CCA
1998 MT7-78 800CCA -AGM
1997 MTP-78 800CCA -Alternate/Optional MT-75 700CCA
1997 MT7-78 800CCA -AGM
* AGM (absorbed glass mat) recommended for high-accessory-load vehicles including frequent plug-in use. 48 Month Free Replacement
* Mega-Tron Plus Longest life in cold to moderate climates. 30 Month Free Replacement Six Year Performance Warranty
* Mega-Tron II Longest life in hot to moderate climates. 24 Month Free Replacement Five Year Performance Warranty
Battery Size index:
http://www.rtpnet.org/teaa/bcigroup.html
In Inches Length x Width x Height
Group 75: 9 1/16....7 1/16...7 11/16
Group 78: 10 1/4....7 1/16...7 11/16
Group 86: 9 1/16....6 13/16..8
Hope this helps
Battery Sizes and option Per Interstate Battery Site: Most likely can be mixed between the years.. size looks to be about the same, some have more CCA then others and they do have a AGM. The Number is the "Battery Group" (Size). My guess is that you can swap in a larger batter with little to no work. I would Recommend a good AGM battery, they dont leak acid if they crack or fail like a normal battery. I like interstate myself but there are others that are good. From what i remember i think you can put a Group 78 in place of a 75 amd vice versa.
Battery sizes stock for C5 Corvette's by year:
2004 MTP-86 640CCA
2003 MTP-75 700CCA
2002 MTP-75 700CCA
2001 MTP-75 700CCA
2000 MTP-78 800CCA -Alternate/Optional MT-75 700CCA
2000 MT7-78 800CCA -AGM
1999 MTP-78 800CCA -Alternate/Optional MT-75 700CCA
1999 MT7-78 800CCA -AGM
1998 MTP-78 800CCA -Alternate/Optional MT-75 700CCA
1998 MT7-78 800CCA -AGM
1997 MTP-78 800CCA -Alternate/Optional MT-75 700CCA
1997 MT7-78 800CCA -AGM
* AGM (absorbed glass mat) recommended for high-accessory-load vehicles including frequent plug-in use. 48 Month Free Replacement
* Mega-Tron Plus Longest life in cold to moderate climates. 30 Month Free Replacement Six Year Performance Warranty
* Mega-Tron II Longest life in hot to moderate climates. 24 Month Free Replacement Five Year Performance Warranty
Battery Size index:
http://www.rtpnet.org/teaa/bcigroup.html
In Inches Length x Width x Height
Group 75: 9 1/16....7 1/16...7 11/16
Group 78: 10 1/4....7 1/16...7 11/16
Group 86: 9 1/16....6 13/16..8
Hope this helps
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