I’m running an 80lb. Ultrex. The batteries I currently have are Interstate SRM-31s. Both are bad. I’m looking for input. Should I go back with two new fresh SRM-31s?

I noticed this years ago I had one interstate and one everstart, take the label off and they looked exactly the same, then later at academy I notice the same battery was also badged exide, I imagine they all come from the same factory.

Well maybe but I have better luck with interstate.

I think there is a huge swing of opinion on TM batteries. Taking brand out of the equation, the discussions have been about type.. Lead Acid vs AGM vs Lithium. The biggest thing that I see is if you go with Lithium, its a really big investment up front and unless you have a charger that is Lithium ready, you will have to replace your charger as well. The pro's for lithium are the huge weight reduction and they seem to last a lot longer per charge than either AGM or LA.
I have lead acid's from Walmart in my boat. They are 2+ years old and for sure will need to be replaced sometime next year. I don't fish enough to justify the investment in Lithium, so for me its either lead acid or AGM. Based on comments here, if AGM is the choice, then the Duracell at Sam's is the deal to be had. A lead acid battery that looks interesting to me is not a marine battery at all but a commercial battery from NAPA. My crank battery is a NAPA battery made by DEKA that has been a good battery. Lowe's sell the DEKA badged batteries but you have to order them, not stocked in stores. Lowes is a little cheaper than NAPA but they have them on the shelf.
Good luck with your search.
BD

It was posted by another member that NAPA was phasing out the lead acid that we’ve been using, it’s going to be an agm only now. Thumbs down...

Duracell AGM Grp 31 at Sams is made by Penn East who also makes Deka and several others. Great batteries. Got 6 years out of last set. Only issue is they are pretty heavy. 100 amp hrs for each battery.