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Battery Replacement


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Been reading through the "Let's talk batteries" thread and it got me thinking.

I currently have two starting batteries, one used for the engine and one used as house battery. They are hooked via a Bluesea Add-a-battery kit (ACR and switch with off/on/combine) The house battery is dead as it has been being completely drained a couple of times and needs to be replaced. What are my options as far as replacing just the one? I know the rule of thumb is replace all at once but why if the are seperated 95% of the time? Can I replace the house with an AGM/gel battery? I am thinking of just replacing the house with a deep cycle marine house battery but going with a better AGM/gel battery might be better off in the long run.

-Svence

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Do not mix batteries and yes it sucks to replace both of them .

You want matched batteries and keep them maintained the same . A older battery [ Read , weaker ] can bring down a good battery real quick and cause them both to fail AGAIN when use together .

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  • 2 weeks later...
So pick up a new start and a new deep cycle at the same time, I was hoping you weren't going to say that.

-Svence

You shouldn't put a deep cycle and a starting battery on the same circuit. They are for different purposes and have different charging requirements.

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You shouldn't put a deep cycle and a starting battery on the same circuit. They are for different purposes and have different charging requirements.

How are people running deep cycle batteries then when you only have one outboard? I have the Blue Sea add-a-battery kit installed to keep them separated on discharge 99% of the time and the acr for charging them.

-Svence

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How are people running deep cycle batteries then when you only have one outboard? I have the Blue Sea add-a-battery kit installed to keep them separated on discharge 99% of the time and the acr for charging them.

-Svence

Based upon what you are saying it seems that the batteries are separated and have different duty cycles.

The house battery probably does have a harder service life and could be replaced by its self.

Since you don't replace all the batteries every year I like the idea of doing them separate, that way you always have a new battery on board.

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