Jump to content
Justin L.

Agm vs Normal battery

Recommended Posts

I currently have a 92ah agm battery that I use for my trolling motor on a 12ft jon.  The trolling motor is my main motor(transom), because I can only use electric motors at the lake I fish. I want to get another battery, but AGM batterys are 2-3x more expensive.  Can someone explain to me all the nuances and how/what maintenance i will have to do after every trip if I get a normal/flooded battery? 

Share this post


Link to post
Share on other sites
2 hours ago, Justin L. said:

what maintenance i will have to do after every trip if I get a normal/flooded battery? 

Charge it

  • Like 1

Share this post


Link to post
Share on other sites

slonezp is right use it all day and recharge it right away for maximum life. I have run the same 3 Cabelas group 30 AGM batteries for over 7 years and they are fantastic. I also plug in my on board charger when I return.

 Make sure to purchase a charger designed for charging AGM batteries. They are not expensive but you need one. They charge differently and the charger knows how to do it correctly.

Share this post


Link to post
Share on other sites

Water level must be maintained in a flooded cell battery. Distilled water is recommended. AGM's are sealed and require little to no maintenance. Keep terminals clean and tight whichever way you go.

Share this post


Link to post
Share on other sites
11 minutes ago, jbh3 said:

Water level must be maintained in a flooded cell battery. Distilled water is recommended. AGM's are sealed and require little to no maintenance. Keep terminals clean and tight whichever way you go.

So when water levels go down just refill?  And also can you explain to me why AGM's are so much more expensive if they perform the same?  thanks so much

Share this post


Link to post
Share on other sites
1 hour ago, Justin L. said:

So when water levels go down just refill?  And also can you explain to me why AGM's are so much more expensive if they perform the same?  thanks so much

They dont perform the same. Wet cell deep cycle batteries are better performers, require maintenance, and must be mounted top up bottom down. agm's require no maintenance and can be mounted in any configuration 

  • Like 1

Share this post


Link to post
Share on other sites
4 hours ago, Justin L. said:

So when water levels go down just refill?  And also can you explain to me why AGM's are so much more expensive if they perform the same?  thanks so much

Yes, add distilled water to a level so that the plates are immersed. In a lot of cases, AGM batteries will be heavier and have better ratings for CCA/MCA and Reserve Capacity compared to a wet cell of the same group size. More lead = more capacity and more $$$. I believe one reason that wet cell batteries fail prematurely is that folks don't maintain the water level. Both battery styles need to be charged ASAP when discharged. Personally, I get better service and a LOT fewer headaches with AGM's. Good luck what ever you choose.

Share this post


Link to post
Share on other sites
3 hours ago, slonezp said:

They dont perform the same. Wet cell deep cycle batteries are better performers, require maintenance, and must be mounted top up bottom down. agm's require no maintenance and can be mounted in any configuration 

 

Can you explain the "Wet cell deep cycle batteries are better performers" portion?

Share this post


Link to post
Share on other sites
1 hour ago, BrianinMD said:

 

Can you explain the "Wet cell deep cycle batteries are better performers" portion?

Apples to apples the reserve capacity on wet cells is greater than the same group agm

Share this post


Link to post
Share on other sites

AGM, can be used in any orientation, even upside down but has 10% less capacity when used on it's side or upside down.  Flooded cell batteries, even the ones with sealed caps must be used in the right side up position.

 

AGM is safer for salt water use.

 

AGM can cause problems with charging systems of outboard motors not designed to use them, so if the motor is more than a few years old, it's probably not designed to run AGM's.  Also, any charging system, car, boat, or battery charger not designed to charge AGM batteries will shorten the life of the battery.

 

For similar physical size batteries, (same or similar group number) the AGM will typically have 25% less run reserve minutes than a high end flooded cell battery.

 

A quality AGM that's properly charged and maintained has a higher cycle count than a flooded battery.

 

AGM does require less maintenance than flooded cell batteries but you should make it a habit to clean/maintain all battery terminal connections at least annually.

  • Like 1

Share this post


Link to post
Share on other sites

I have two walmart $120 deep cycles that are going on 5 yrs now.  I use a Schumaker auto charger after every trip.  I have only needed to add water once so far and have not noticed any diminished charge capacity.   I don't use agm batts in the boat but we have a bunch at work.  They are supposed be able to be discharged deeper and more discharge cycles before going bad.   The old optimas we had amazing longevity. avg life 10 yrs or so.  We started having problems with the newer ones and have been switching around ever sence.  Not sure who makes a good AGM batt these days.

Share this post


Link to post
Share on other sites

Optimum batteries was bought by Interstate several years ago.

VMax makes excellent AGM marine batteries and Odessey is a popular AGM marine battery.

My AGM batteries are 2005 vintage and still going strong, they were 1 year old UPS back up commercial batteries, 2 size 31's and a size 27 for cranking/electronics etc., about $50 each. I thought if I got a few years out of them it would be a good deal. 

Tom

  • Like 1

Share this post


Link to post
Share on other sites

My Bluetop starting battery lasted me 11 seasons.  The Bluetop trolling batteries went 12 seasons.

 

Replaced them with Duracell (Deka) AGM 31s.  On paper, they looked to be a better option.  They have been great so far and I saved a bunch of $$$ over getting Optimas.

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

    fishing

    bass fish

    fish for bass
    fish

×