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 * 2001 F150 SuperCrew 2006 Keystone Springdale 249FWBHLS 675 watts solar Send a PM if I missed something 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 2011 F-150 HD Ecoboost 3.5 V6. 2550 payload, 17,100 GCVWR - 2004 F-150 HD (Traded after 80,000 towing miles) 2007 Rockwood 8314SS 34' travel trailer US Govt survey shows three out of four people make up 75% of the total population 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: 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: 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 Dick & Karen Richardson,TX 2007 KZ Spree 240RBS 03 Tahoe/09 F250 V10 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. Home is where I park it. Kenwood TS-2000 housed in a 2005 Damon Intruder 377 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. 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: 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: 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. when u play in the sand .... you can get stuck 9-24-08 corpus christi padre island texas. wrecker had to haul me out! '92 dp 5.9 cummins 190 hp....8mpg yuck! 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...