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Battery Charging Compatibility #5439057 05/26/20 07:11 AM
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cb450sc Online Content OP
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This is a marine application but I thought I might get more reads and knowledge if I put it here. The Interstate group 27 deep cycle battery in my boat called it quits last fall. It didn't owe me a thing as i have had it for eight years. I purchased an AGM replacement for it yesterday and put it on the charger prior to installing it in the boat. After careful thought I wonder if I made a wise choice. My starting battery is a regular lead battery. I have an on board smart battery charger that connects to both batteries and is tuned on whenever I am not on the boat. Is it wise to have two different battery types on the same onboard charger and would each be fully charged?

Re: Battery Charging Compatibility [Re: cb450sc] #5439077 05/26/20 07:30 AM
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Donald Offline
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I guess the question is does/can the charger treat each battery separately? Each with its own charging characteristics. I guess you need to read the smart charger directions.


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Re: Battery Charging Compatibility [Re: cb450sc] #5439080 05/26/20 07:32 AM
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I purchased the boat used. No manual included.

Re: Battery Charging Compatibility [Re: cb450sc] #5439088 05/26/20 07:44 AM
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Donald Offline
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Originally Posted by cb450sc
I purchased the boat used. No manual included.


Then you need to get the make/model and track down a manual or email the manufacturer.


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Re: Battery Charging Compatibility [Re: cb450sc] #5439097 05/26/20 08:01 AM
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CTEK says it ok as long as the Ah of the batteries is within the capacity range of the charger.

I say that it would be a compromise for the AGM since it likes a higher charging voltage vs. lead-acid. Chargers aren’t that expensive and a good one can last a lifetime so why not pick up another. You’ll stimulate the economy at the same time!


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Re: Battery Charging Compatibility [Re: cb450sc] #5439099 05/26/20 08:04 AM
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cb450sc Online Content OP
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I found an online manual and it says that the onboard charger charges the batteries separately according to each batteries state of charge. I guess this would answer my own question. Thanks for taking the time.

Last edited by cb450sc; 05/26/20 08:06 AM.
Re: Battery Charging Compatibility [Re: cb450sc] #5439121 05/26/20 08:44 AM
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What voltage does it charge the battery at?

AGM batteries like to be charged at a slightly higher voltage than flooded LA batteries; however, they're more prone sensitive to over-charging. If you gas an AGM to the point where the reliefs lift, that electrolyte is gone forever. I wouldn't say this is a problem while operating the motors to charge an AGM battery, but the trickle charger may maintain too high of a voltage for too long or not maintain a high enough charge long enough to fully charge it.


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Re: Battery Charging Compatibility [Re: cb450sc] #5439122 05/26/20 08:45 AM
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Is there a switch to change between batteries? If you’re charging, make sure they’re isolated from one another.

Not only will the capacity, state of health, impedances, etc. vary, but the appropriate charge voltage and behaviors are different. So it’s best to charge independently. If they’re wired in parallel based upon switch position, you just need to be careful.

Re: Battery Charging Compatibility [Re: cb450sc] #5439124 05/26/20 08:47 AM
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Donald Offline
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Originally Posted by cb450sc
I found an online manual and it says that the onboard charger charges the batteries separately according to each batteries state of charge. I guess this would answer my own question. Thanks for taking the time.


Does the manual for the charger say anything about AGM batteries?


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Battery Charging Compatibility [Re: cb450sc] #5439125 05/26/20 08:49 AM
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remember if you do any replacement of the charger it needs to be a marine one and listed for use in engine bay if that is where its located.


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Re: Battery Charging Compatibility [Re: cb450sc] #5439246 05/26/20 11:15 AM
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IMO it depends on how Smart the charger is. Newest ones have strong analysis mode of the attached cells and apply just the right amount of current/rate to fill them up without damage. Charging different battery types in parallel would defeat the smart part of the charger.

Re: Battery Charging Compatibility [Re: cb450sc] #5439434 05/26/20 02:46 PM
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If your trying to keep both charged and they are wired to charge together, the charge level in both, will only reach the capacity of the weakest battery. The newer battery will be less, then what it could be if charged separately. If you can charge them separately, that's what I would do.,,

Re: Battery Charging Compatibility [Re: Donald] #5439538 05/26/20 04:39 PM
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Yes it says the charger is fine for AGM batteries

Re: Battery Charging Compatibility [Re: cb450sc] #5442531 05/30/20 01:17 PM
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Just a follow up. I installed the battery and connected it to the charger. There are separate red/green lights for both batteries. Both came up green, fully charged, so I think I will be fine. I also emailed,ed the manufacturer. They said it charge each battery separately. Thanks for everyone's comments.

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