My current battery is a 24M 550CCA 690MCA. Will it hurt if I go with a larger battery with more CCA and MCA?

No. It won't hurt anything to go with a bigger battery. Except your pocketbook. Cold cranking amps at 0 degrees has very little to do with a battery that isn't starting a boat/car. So increasing CCA, will not help at all. Pretty much the same as MCA. Marine cranking amps at 32 degrees.Chances are that any good deep cycle battery will need replacement after 3-4 years anyway. Regardless of capacity. My advice is get the minimum capacity that will do the job. But buy a good name brand.A marine deep cycle may have dual duties. And starting a boat engine is one of them.There are other deep cycle battery applications. Such as for an RV, or a trolling motor, etc. If you are NOT staring an engine, why pay the extra for a deep cycle MARINE battery?

Deep cycle batteries are designed for deep discharge cycles. If you regularly discharge your battery while boon docking then a deep cycle battery may be a better option. If starting batteries are discharged frequently below about 50% of capacity then they tend not to last very long. Deep cycle batteries are more expensive, but are designed for most RV applications. I use deep cycle batteries on my boat for both my starting and house batteries.

I tend to avoid marine batteries for deep cycle RV use. I feel that a deep cycle battery will tend to support very occasional starting (like a generator, or jump starting the engine) better than start batteries (which is what marine batteries are biased towards) will support mostly deep cycle use.But to answer your question, no, there is very little downside to a larger battery as long as you can charge it.Brian

Downside is that a deeply discharged "deep cycle" battery can be damaged via charging with the chassis system.Lots of outgassing.

No there is no harm in upgrading as you described. However you should be made aware of the following:- that M in 24M means it is primarily a starting battery not deep discharge- find a dual duty battery that is D such as 24D or 27D, it's more of a dual duty battery than a starting battery- if the battery label doesn't have a 20hr AH capacity rating it is not a deep cycle battery. CCA and MCA are not ratings that can be used for deep cycling ability directly, although bigger is better.

Deep Cycle Marine Batteries | Good Sam Community

Vulcaneer
Explorer
Jun 23, 2014
No. It won't hurt anything to go with a bigger battery. Except your pocketbook.

Cold cranking amps at 0 degrees has very little to do with a battery that isn't starting a boat/car. So increasing CCA, will not help at all. Pretty much the same as MCA. Marine cranking amps at 32 degrees.

Chances are that any good deep cycle battery will need replacement after 3-4 years anyway. Regardless of capacity. My advice is get the minimum capacity that will do the job. But buy a good name brand.

A marine deep cycle may have dual duties. And starting a boat engine is one of them.

There are other deep cycle battery applications. Such as for an RV, or a trolling motor, etc. If you are NOT staring an engine, why pay the extra for a deep cycle MARINE battery?

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