AGM battery?

[Dusty]

Good read ,my question was when I went from lead acid to AGM in my truck , was the charging system compatible with AGM . I know when I went to AGM with my electric trolling motor I had to buy a charger that had the AGM charging mode . Likewise when I went to lithium with my electric trolling motor had to again but another charger that had the Lithium charge mode . I am a bit charger poor now . But I do have everything covered .

Anyway make to the truck ,I don't really remember now about the AGM compatibility , but I do remember checking into it ,and it was okay to use . Must be , it's been a couple years now .

I think this is the reason the article suggests replacing a battery with like type and maybe why some folks report different longevity results with AGMs.

AGMs have a lower internal resistance which makes them quicker to charge but highly sensitive to overcharging. My current 2019 Ram indicates a voltage of 14.7 volts all the time in this kind of weather. I'm pretty sure that is too much for an AGM.

Regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, 18” wheels. Build Date: 3 June 2018. Now at 143902 miles.

 

[truck2014]

Odyssey H8 + 6.4 alternator + Noco onboard battery tender.

This is my secret sauce , heck all my vehicles have Odysseys withs Noco onboard battery tenders.. lol

I live in a small town, If I lived close to a Costco you best believe Id grab H8 AGM from there as they don't test them when you bring them in. So new H8 every 3y

My old man does it with his Cummins batteries

Yup, here in the US Costco has went to the 3 year prorate .That is why there is no longer a decent warranty from Costco , people doing that exact thing , turning in perfectly good batteries for new ones before the warranty expired . It's unfortunate .

 

[RamDiver]

That's the million dollar question here, With alphaobd you can go into the charging profiles, unfortunately they are numbered, 1...2....3.. etc so while you can change it does anyone know what number corresponds with what profile?

I emailed Alexey, and he didn't have any ideas about the different battery ID #s.




LiPO would be an interesting chemistry for a starting battery, certainly wouldn't be my preference. Is the battery remote from the engine bay?

Li batteries are sensitive to extreme hot or cold temperatures. Either condition could compromise performance and longevity during a charge cycle.

If you hope to keep this battery healthy and functional for any extended period of time, I would suggest you read up on the charge & discharge guidelines.

LiPo Battery Charging and Discharging Principles | LiPo_Battery_com

lipo-battery.com

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[express2014]

I have a 2500 cummins with 2 agm batteries, I do like them but whats everyones opinion on LiPo batteries? I have one in my wifes 2021 VW Jetta, Only had it now for 6 months now, other then it is light as can be I don't know that I have any good/bad or other experience with it

Dont use LIPO. when the charge controller in the battery senses it is full it opens up the circuit, this will cause overvoltage and fry the alternator.

 

[DILLIGAF]

Wife 2019 Rav 4 had the original battery in it. To my surprise is was a POS H5, Last week in the cold snap it Sh!te the bed. So I obviosity put in a H6 AGM I had kicking around Toyota were nice enough to have a secondary bolt hole so it dropped right in with the factory bracket.

AGMs I put that sh!te in everything

 

[D1DAVE]

Read this,


I love AGM batteries. When Harley-Davidson put them as OE in 1997, it took care of a variety of issues, including frame damage from acid leaks. But they require a different charger. Note the difference between 80 percent and 100. I am pretty positive that
our charging systems cannot maintain that level. Even worse, if it goes dead it will need to go on an AGM charger to get it back to that level. For the time being, I will stick with flooded batteries. Oh and DEKA makes H-D batteries. Good product!
Just my 2 cents.

 

[Jeepwalker]

After buying batteries for decades, I usually get about 9 yrs out of a Premium L/A battery, and 12-14 years out of Optima Yellow Top batteries (I've run several). I'm real careful to NOT let them run down.

Considering the cost difference, you need to see what makes sense for you, your use-case ...and your pocketbook. Nowadays I just run premium L/A batteries. Costco has the best deal running AFAIK. But I get them from other places too.

 

[Grams]

Four pages and 67 replies the OP never came back to read….

My solution to battery problems: Walmart

Fresh Everstarts made by Johnson Controls and at the best prices with free installation. doh

 

[Hootbro]

Four pages and 67 replies the OP never came back to read….

OP's last login was December 28th, 2025. He is probably caught up through post #64.

 

[DILLIGAF]

I'm pretty sure that is too much for an AGM.

Weird -40 here says otherwise You guys dont even know what cold is. I just googled average NY winter temps, its literally short and T-shirt weather...lol....

 

[turkeybird56]

Weird -40 here says otherwise You guys dont even know what cold is. I just googled average NY winter temps, its literally short and T-shirt weather...lol....

@DILLIGAF

With all respect sir, U can keep that friggin minus (-) number, lol. 33F outside this AM, that cold enuf fer dis BOIRD.

WHEN we had that freak ice/snow storm, 8", -5F, friggin no power, broken water pipes all over state, state shut down for 4-5 days this area, and bunch of PPL died. This place (whole state), built to keep cold in house, not out of house. Wish I would have had my new windows in when it happened, but I only got done in 2024. Luckily, I had a lil 4350 W genny to keep some things good and run a few space heaters since it was like 40F in house, brrrrrrr.

CAVEAT: Not a snow plow in the county. They used road graders to "plow" the ice, make it nice and shiny.

BACK ON TOPIC: I run H7 AGM in my RAM, AGM in my Honda Motorcycle, and my 24 Cub Cadet riding mower came with AGM.