What batteries do I need

[Maineforlife87]

I have a HMMWV M1123 with a 6.5 non turbo engine looking for what size batteries I need for it any information would be greatly appreciated thank you

 

[Mullaney]

I have a HMMWV M1123 with a 6.5 non turbo engine looking for what size batteries I need for it any information would be greatly appreciated thank you

.
You can use 24 or 27 series standard batteries.
Or, you can use the factory type (almost square) batteries.

 

[TNDRIVER]

I have a HMMWV M1123 with a 6.5 non turbo engine looking for what size batteries I need for it any information would be greatly appreciated thank you

6T's from the Government side. Group 24 are the right size height wise. I will not give advise but tell you what I've done. One truck has Odyssey 6t's , one replaced under warranty but will not use them again they have become stupid expensive. The other truck has Wall World Group 24 AGM's . The W W batteries have a better warranty (It seems to change a bit depending on where you live.) and price. The same battery is available from the usual suspects but more expensive. If you use the 24's place some blocking and/or anti skid material under/ around the bottom of the batteries. Works for me.

 

[Milcommoguy]

DITTO with the gorilla guy. Warranty and availability, over the counter at discount stores. Lasts just has long, a LOT easier on the wallet & 6TL's too damm heavy.

Be nice to them.. They don't have 9 lives. PMCS, don't leave them dead or dry, over / under charged (float) and figure 5 years. My old auto shop teacher said "Wet cell battery has two states. Charged and discharged" Not a very good storage battery

IMO...Don't monkey around with got's to be OEM, CAMO

 

[TOBASH]

$60 24f from Wallyworld

 

[Mogman]

Do you have a "company" Interstate battery store near you?
If so I would look to see if they have any AGM "recon" group 24, 27 and IIRC someone managed to stuff some group 31 batteries in there.
I have had real good luck with the "recon" batteries which are 99% just batteries that the shelf life has expired on.
I personally would never run standard lead acid batteries in a passenger compartment because of the chance of a hydrogen explosion given the rather sealed battery compartment the HMMWV has and of course if you are ever unlucky enough to roll it then you have an acid spill to deal with although there would be a rather small chance of that happening.
I had a real bad run of Wally World batteries, three that just quit, no warning and no output, but your mileage may very..

 

[TNDRIVER]

$60 24f from Wallyworld

AGM's ,you can dunk them. Not $60.00

 

[Coug]

Best: AGM. will hold up better to abuse and vibration than flooded.

Second best: Maintenance free flooded lead acid. don't need checked monthly for fluid level.

Last place: flooded lead acid. Will need checked monthly for fluid level and topped off with distilled water as necessary, will leak if tipped or shaken badly, and when charging (and especially if overcharged) create hydrogen gas and oxygen, essentially turning the battery compartment into a small bomb (and yes, I've seen pictures from the explosion)


As for size, 6T is what the military uses, but that's simply because they use those in larger trucks, and supply chain logistics for that large of an organization it's easier to use an oversized battery than stock multiple sizes. Major downside of 6T is in the civilian world they are considered a Commercial/Specialty battery, meaning a lot of places don't stock them, and they only come with a 6 month warranty. Also much more expensive than a comparable quality group 24 battery, that at minimum comes with a 1 year, and can be found with 4 year full replacement warranties.

Group 24 with flat tops (usually either AGM or maintenance free) will work with the original hold down bracket, making install very easy (there is a 1/2" thick board in the front and rear to keep them from shifting since the positive post is kind of close to the front of the battery box)

 

[MarkM]

I went with the Optimas and haven't looked back after 4 years and going strong.

Mark