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Topic: Walmart Maxx 24DC Battery _ Seems Good

Posted By: cruz-in on 04/03/12 10:52am

Hi All,

Just out at my local Walmart, they have a battery labeled Maxx 24DC Deep Cycle for trolling, etc. It is 94 amp hours and has a 2 year replacement warranty. Sticker says it is good for 30% more cycles (than the normal Everstart Marine I assume). Price is $79. In my searching for RV batteries, this one does not look too bad?

Interesting if you go to the website, and search for MAXX deap cycle batteries, the picture is of a MS model (I assume that means marine start?)not the one in the store.

You all's thoughts?


Posted By: smkettner on 04/03/12 11:02am

94 amp hours from a group 24 is a deep cycle. Probably the 100 hour rate.
DC 27 is a bit bigger if needed and will fit.

On edit: Actually the 94 would seem to be Reserve Capacity (RC) minutes and not amp hours. Still a deep cycle. Just don't compare the wrong units and expect additional performance.

* This post was last edited 04/03/12 02:53pm by smkettner *


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Posted By: cruz-in on 04/03/12 11:06am

Thanks the walmart only had Maxx 24DC and Maxx 29DC. I don't think the Maxx 29DC will fit...

* This post was edited 04/03/12 11:12am by cruz-in *


Posted By: midnightsadie on 04/03/12 11:49am

before you buy ,look at the date it was made, if older than six months go find another wal mart. or ask when the next shipment is coming in.


Posted By: cruz-in on 04/03/12 11:52am

midnightsadie wrote:

before you buy ,look at the date it was made, if older than six months go find another wal mart. or ask when the next shipment is coming in.



thanks...good advice


Posted By: skipnchar on 04/03/12 01:20pm

Will probably be better than the EVERSTART but I never got more than about a year out of an Everstart battery. If you dry camp you'd probably be better off with a better battery but if you MOSTLY camp with hook ups the Max will work just fine.
Good luck / Skip


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Posted By: wa8yxm on 04/03/12 02:59pm

It is 73 amp hours, not 94, Wal-mart rates the capacity of the battery at the one amp rate, so it will last 94 hours at that rate.

However for comparison you should use the 20 hour rate, and at that rate it's 73 amp hours.

Other than that. Not a bad battery, just small.


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Posted By: kneal44 on 04/03/12 03:24pm

i teamed up a walmart 24 with two sams six gc.
seems to work and is two years old now.


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Posted By: MEXICOWANDERER on 04/03/12 05:44pm

Charge that battery @ 4 amps for at least 8 hours when you get it home. This excellently conditions new plates, stirs the electrolyte and gets things off to a good start. For the techhies: let the voltage rise to 15 then terminate the charge.


Posted By: dclark1946 on 04/04/12 05:58am

smkettner wrote:

94 amp hours from a group 24 is a deep cycle. Probably the 100 hour rate.
DC 27 is a bit bigger if needed and will fit.

On edit: Actually the 94 would seem to be Reserve Capacity (RC) minutes and not amp hours. Still a deep cycle. Just don't compare the wrong units and expect additional performance.


100AH is possible from a GR 24. Trojan rates the SCS 150 @100 AH for 20 hour rate. The Gr 27 version is rated at 115 AH.

Dick


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Richardson,TX
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Posted By: Retired Phone Man on 04/04/12 06:06am

cruz-in wrote:

Hi All,

Just out at my local Walmart, they have a battery labeled Maxx 24DC Deep Cycle for trolling, etc. It is 94 amp hours and has a 2 year replacement warranty. Sticker says it is good for 30% more cycles (than the normal Everstart Marine I assume). Price is $79. In my searching for RV batteries, this one does not look too bad?

Interesting if you go to the website, and search for MAXX deap cycle batteries, the picture is of a MS model (I assume that means marine start?)not the one in the store.

You all's thoughts?


I just bought that same unit yesterday. I normally use full hookups so it is fine for my needs when on the road.

Jim


2007 Toyota Tundra SR5 Double Cab with 5.7L V8 and Tow Package.
2007 Gulf Stream Ameri-Lite 21MB
Peaches - Lhasa Apso/Mut Mix


Posted By: gijoecam on 04/04/12 11:04am

wa8yxm wrote:

It is 73 amp hours, not 94, Wal-mart rates the capacity of the battery at the one amp rate, so it will last 94 hours at that rate.

However for comparison you should use the 20 hour rate, and at that rate it's 73 amp hours.

Other than that. Not a bad battery, just small.


Your math is confusing me.... A one amp discharge rate for 94 hours equals 73 amp*hours? I'm a confused mechanical engineer...


Posted By: smkettner on 04/04/12 11:19am

gijoecam wrote:

Your math is confusing me.... A one amp discharge rate for 94 hours equals 73 amp*hours? I'm a confused mechanical engineer...


1 amp for 94 hours = 94 amp-hours
3.6 amp for 20 hours = 73 amp-hours

Discharge at 10 amps and the amp-hours will drop in half again.
The faster you discharge the less power you get.
search wiki for "peukert" for more info.


Posted By: wa8yxm on 04/04/12 04:29pm

gijoecam wrote:

wa8yxm wrote:

It is 73 amp hours, not 94, Wal-mart rates the capacity of the battery at the one amp rate, so it will last 94 hours at that rate.

However for comparison you should use the 20 hour rate, and at that rate it's 73 amp hours.

Other than that. Not a bad battery, just small.


Your math is confusing me.... A one amp discharge rate for 94 hours equals 73 amp*hours? I'm a confused mechanical engineer...


There is something I can not recall the spelling of.. Starts with P, Hopefully someone will jump in and name the effect.

Basically it works like this, The faster you discharge a battery, the faster still it runs out of power.

Wal-mart rates the batteries at the 1 amp rate, so a G-24 can put out one amp for however many hours.

But the standard used to compare batteries is the 20 hour rate. and that would be about 3.75 amps for this same battery (I'm rounding)

OH, I man not know how to spell the name of the effect, or law, but Google and Wikipedia do. Here is a cut and paste from Wikipedia that happens to explain the math.. sort of (I left out the meaning of the letters)

The relationship between current, discharge time, and capacity for a lead acid battery is approximated (over a certain range of current values) by Peukert's law:

t = \frac {Q_P} {I^k}

To make it easier Here is the Wikipedia page.


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