Best replacement battery?

IdahoKTM · Jan 19, 2026

Well, after 17 months my Odyssey H8 is done. I didn't put on a maintainer for the first 7 months or so and maybe that shortened its life. Going forward, I will keep the new battery plugged in at all times when it's parked in the garage. When I first tested the battery, it showed 880 CCA. I figured that was normal for a battery that advertised 950 CCA.

I replaced it with an Everstart Platinum H8. I tested the battery and it's showing 850 CCA, even though the specs say it has 900 CCA. Hopefully this is a better battery. If not, it was half the cost of the Odyssey.

Two · Jan 20, 2026

IdahoKTM said:
Did you connect your charger to this post? I believe it's the IBS.

View attachment 155524

No, haven't tried that yet. By now I know that grounding to a fender bolt works, but it'll be easy enough to start using that post and see what happens.

evillrdnikon · Jan 20, 2026

adding here. I went with a battery at costco. so far so good! used an H8 and it fits

UnloosedChewtoy · Jan 20, 2026

IdahoKTM said:
Well, after 17 months my Odyssey H8 is done. I didn't put on a maintainer for the first 7 months or so and maybe that shortened its life. Going forward, I will keep the new battery plugged in at all times when it's parked in the garage. When I first tested the battery, it showed 880 CCA. I figured that was normal for a battery that advertised 950 CCA.

View attachment 155531

I replaced it with an Everstart Platinum H8. I tested the battery and it's showing 850 CCA, even though the specs say it has 900 CCA. Hopefully this is a better battery. If not, it was half the cost of the Odyssey.

Well, I guess that’s another company that we can add to “went in the crapper.” Sorry to hear it dude.

LarryMopar360 · 2026-01-30T14:50:14-0500

UnloosedChewtoy said:
Well, I guess that’s another company that we can add to “went in the crapper.” Sorry to hear it dude.

It's so sad that so many have to be added to this list. So many parts in general!

Exec_TRX · 2026-01-30T22:00:10-0500

have had a few Odysseys and never had a problem. Similarly my 392 Jeep, which I usually keep connected to a 2Amp Noco maintainer, as the drone compustar system will drain the battery in about a week. Been driving it more, kept it off the charger for 4 days when I didn’t charge it and after the first start the battery was dead, had to jump it at my next stop with my Pack.

In the Siberia weather we have, I notice once it’s parked it’s down to 12v and less after only a couple hours. Think it’s shot. Exactly 2 years on this odyssey. Looking now for an alternative. The stock battery in this was a POS that lasted less than 2 months new. Might go over to a deka or Napa platinum (eastpenn) the only other US battery mfg, if I can’t find a OG interstate made by eastpenn

My original Stellantis battery lasted 3 months in my TRX and about 2 months in the Jeep. Both were clarios. Trash.

Tut · 2026-01-30T22:13:53-0500

Yellow top still going strong for over 2 years. It’s -5F outside and the battery is showing 12.3v.

Two · 2026-01-31T11:00:33-0500

Exec_TRX said:
...kept it off the charger for 4 days when I didn’t charge it and after the first start the battery was dead, had to jump it at my next stop with my Pack.

I notice once it’s parked it’s down to 12v and less after only a couple hours. Think it’s shot.

If there's one thing Odyssey batteries don't like, it's being completely discharged. No battery does, but they seem to be unusually sensitive to it.

I'm starting to have more and more confidence in Weize batteries. Not that I've had any of them for more than about two years, but still, for the price...

Then again, my '21 TRX is on its original battery, as is the '18 Challenger, and the '17 Ram 3500. Plus I have at least 12 regular wet batteries that are a minimum of 10 years old and still fully functional. Guess I'm doing something right.