Preferred Battery?
Melting Slicks
Joined: Oct 2005
Posts: 2,586
Likes: 141
From: Palm Beach Florida
I heard good things about their batteries. Will the Corvette trickle charge work on AGM batteries?
Le Mans Master
Joined: Dec 2000
Posts: 5,348
Likes: 3,319
AGM batteries are excellent in applications designed for their use. I question whether the C7's charging system will sense the installation of an AGM and properly charge it.
The issue is AGM batteries are sensitive to overcharging. Automotive charging systems designed for flooded lead acid batteries (the stock battery in a C7) typically have a higher floating voltage. As a result, the installation of an AGM battery could overcharge the battery, especially on a long drive. (The requirement if a lower floating voltage is why CTEK chargers and others have dedicated settings for AGM batteries.)
The C7 charging system does not have a fixed float voltage setting however and various depending on load, etc. Thus, it may accommodate an AGM. My recollection is some here have used AGM with good results.
The issue is AGM batteries are sensitive to overcharging. Automotive charging systems designed for flooded lead acid batteries (the stock battery in a C7) typically have a higher floating voltage. As a result, the installation of an AGM battery could overcharge the battery, especially on a long drive. (The requirement if a lower floating voltage is why CTEK chargers and others have dedicated settings for AGM batteries.)
The C7 charging system does not have a fixed float voltage setting however and various depending on load, etc. Thus, it may accommodate an AGM. My recollection is some here have used AGM with good results.
Safety Car
Joined: Mar 2018
Posts: 4,754
Likes: 1,650
Update: I went back and re-read the owner's manual for the CTEK 3300 (model 1051). The manual indicates on page 9 this maintainer can be used on an AGM type battery as long as the battery is rated no higher than 90 amp-hours. The Batteries Plus battery I posted is rated at 67 amp-hours. Final upshot is you can use your Corvette CTEK battery maintainer on an AGM battery. Sorry for the confusion.Last edit
Last edited by MMD; Oct 10, 2020 at 08:11 PM.
