Jump to content

Slow charge versus fast. Which is better for battery?

Recommended Posts

Generally, when I am not in a hurry to charge my deep cycle batteries (most of the time), I set the charger at 2 amps (versus 6 amps).  However, is this the best choice (better on my battery)?  Or is it simply a case of 6 or half a dozen of the other-metaphorically speaking?

Share this post

Link to post
Share on other sites

There's a ton of information floating around regarding this topic.

IMO - it pays to have 'a decent level of working knowledge' on the subject.

It can save one some time, $$$ & effort in the long run.

Here some basic info ~ 





Share this post

Link to post
Share on other sites

Start with 10 amp then go to 2 amp for batteries that have been drained pretty good. Maybe start with 2 amp if they were only lightly drained. If you only have up to 6 amp option I would start with that, then switch to 2 amp after it has been charging for a while

Share this post

Link to post
Share on other sites

I think it's more important to have the correct charger, rather than the charge rate. My experience with this is I was using a standard automotive, single stage, typical battery charger and my TM batteries weren't lasting as long as I thought they should on the water. After a lot of homework, I learned that deep cycle batteries can benefit from a true marine deep cycle charger. I thought it was wichcraft but I ended up buying a Promariner Prosport marine charger and my batteries have doubled in their capacity. The same, identical batteries; not new ones of the same brand but the same actual bateries that were failing before, now outlast my days on the water with just a change to the correct charger. These chargers use multi-stage charging where the charger fully charges the battery, then automatically ups the voltage to over 14v for a designated time, then back down to a maintain mode. This process cleans sulfate off the plates; exposing more surface area of the plate to generate battery power.


Share this post

Link to post
Share on other sites

If you trickle charge with 3 amps a discharged deep cycle marine battery it may ruin it.

You want to charge deep cycle marine batteries with 10 to 15 amps until fully charge, then you can trickle charge to maintain 13+ volts.

Lots of reason why this happens, go online.


  • Like 1

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

  • fishing

    fishing forum

    fishing rods

    fishing reels


    bass fish

    fish for bass