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Battery - AGM or Flooded?

Old 03-22-2019, 06:46 AM
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Default Battery - AGM or Flooded?

West marine is having a sale on batteries - can anyone tell me which is better (agm vs flooded) for a twin engine center console with a regular power load (radar/gps/etc.).

I see see a lot of agm vs flooded and wondering which one is better for my set up (for the money obciously)

Thanks.
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Old 03-22-2019, 07:01 AM
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I made the switch from flooded to agm and have been pretty pleased. Take a look at Sams Club for their Duracell AGMs - best deal I’ve seen and they usually are pretty reliable.
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Old 03-22-2019, 07:29 AM
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I've had good service out of Optima but it seems like a lot of people like some of the other brands better. Are they better?
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Old 03-22-2019, 07:49 AM
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Deka AGM's work for me - I switched from the Flooded Lead Acid batteries because it was such a pain to access the fill cells to make sure they were topped off periodically. The Duracell AGM batteries at Sams Club are re-branded Deka AGM's. Optimas are a lot more $ than Deka AGM's and I don't know that they are really any better.
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Old 03-22-2019, 07:51 AM
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Everyone says Sam's club ones are the same as the ones they sell at West. I just replaced the original AGM batteries on my boat. I will never go back to flooded.

Mine were still working after 5 years, but the house battery had lost a lot of capacity so I decided it was time. I bought Sam's Club Duracel AGM's for the 3 starting batteries and got a Lifeline 31XT for the house.
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Old 03-22-2019, 08:31 AM
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Originally Posted by fllawyer View Post
I made the switch from flooded to agm and have been pretty pleased. Take a look at Sams Club for their Duracell AGMs - best deal I’ve seen and they usually are pretty reliable.
This is what I did two weeks ago... I had Duracell flooded, 2 in parallel, turned out one was bad and was dragging the other. Only lasted 2 yrs. Switched to Sam's Duracell AGM with the $20 off per battery promo they had in Feb.

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Old 03-22-2019, 10:15 AM
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Originally Posted by JoseG View Post
This is what I did two weeks ago... I had Duracell flooded, 2 in parallel, turned out one was bad and was dragging the other. Only lasted 2 yrs. Switched to Sam's Duracell AGM with the $20 off per battery promo they had in Feb.
I think the $20 off promo is good until Sunday, as I literally just stopped by at lunch to grab a battery and they still had the promo going. A Group 24 was $99.
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Old 03-22-2019, 12:04 PM
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I bought 2 group 31's yesterday for my soon to be trolling motor. price doesn't include $18 core charge, so bring your old ones if you have them.
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Old 03-22-2019, 12:13 PM
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I run AGM's in our RV's and love the no maintenance and rapid recharge rate. But I have upgraded 3 stage C/C's in the RV's. I don't know that the charging profile of an OB engine is sufficient for AGM? Can anyone answer that?
If not, is it worth going to AGM's for an OB?
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Old 03-22-2019, 12:14 PM
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Judge batteries of equal group by weight. AGM's are perfect for boats and off road driving... flooded is fine for less agressive/rough/bumpy applications.
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Old 03-22-2019, 01:09 PM
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Bought two at Sam's club Tuesday afternoon.

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Old 03-22-2019, 01:17 PM
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Sam's has a good full replacement warranty on the Duracells too.
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Old 03-22-2019, 02:33 PM
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Sam's sale is only good till Sunday(24th)
3 year warranty
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Old 03-22-2019, 03:12 PM
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Originally Posted by BillTex View Post
I don't know that the charging profile of an OB engine is sufficient for AGM? Can anyone answer that?
If not, is it worth going to AGM's for an OB?
"an OB engine" casts a broad net.

There was a time - "back in the day" -
when an outboard engine "charging system" did not even have a voltage regulator.

If you ran long enough and hard enough to boil some water out of the battery-
you just topped up the battery with distilled water.
Can't do that with an AGM.

But any 'modern' outboard (say, the last 20 years?)
with a regulator/rectifier that limits voltage output to ~14 volts -
will be fine with an AGM.

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Old 03-22-2019, 03:15 PM
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Originally Posted by BillTex View Post
I run AGM's in our RV's and love the no maintenance and rapid recharge rate. But I have upgraded 3 stage C/C's in the RV's. I don't know that the charging profile of an OB engine is sufficient for AGM? Can anyone answer that?
If not, is it worth going to AGM's for an OB?
AGM's are compatible to flooded cell batteries when it comes to charging.
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Old 03-22-2019, 09:10 PM
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Ill be the naysayer... never had luck with agm lasting I think there a complete and utter waste of $$ esp when group 27 flooded can be had for 80ish bucks.

also remember there are only 2 brands of batteries, johnson electric(most) and some other company i can't remember so do waste money on names...
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Old 03-22-2019, 09:52 PM
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Originally Posted by Semper_gUmbie View Post
also remember there are only 2 brands of batteries, johnson electric(most) and some other company i can't remember so do waste money on names...
So are you including or discounting Surrette's which were original from Bertram & at 8 years were fried due to a failed Constavolt. ?
Rolls Surrette Batteries
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Old 03-23-2019, 01:04 AM
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We have never had so many Battery issues at the Car Lot, as we have had since the Manufacturer has switched to AGM as Std in many New Vehicles.

Autos being a different beast as is -40 temps, but Flooded Batteries failed about 1/2 as many times as AGMs. This could be a Supplier Issue however. But that is what I have noticed looking after 100+ New Vehicles.
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Old 03-24-2019, 05:54 AM
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Originally Posted by Semper_gUmbie View Post
Ill be the naysayer... never had luck with agm lasting I think there a complete and utter waste of $$ esp when group 27 flooded can be had for 80ish bucks.

also remember there are only 2 brands of batteries, johnson electric(most) and some other company i can't remember so do waste money on names...
See comments about AGM requiring different charging profile than wet cell.
How were you charging these?
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Old 03-24-2019, 06:11 AM
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Originally Posted by tmd11111 View Post
AGM's are compatible to flooded cell batteries when it comes to charging.
Not exactly. You can charge an AGM with a standard lead cell charging profile. But it will not be at 100% SOC.
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