Need some help on AGM batteries. I have the lead acid batteries now but wanting to switch to the AGM. Not wanting to jump up to lithium right now. My current lead acids I have a cranking and deep cycles. Looking at AGMs I see a deep cycle and dual purpose. Is the dual purpose a cranking battery. It says it can be used as cranking or trolling battery. So should I get 1 dual for cranking & 2 deep cycles for trolling or 3 of the same dual purpose?

May I suggest this one https://www.odysseybatteries.com/odyssey/pc2150mst.html
Going on 4 years starting a Mercury Pro XS 250

Dual for cranking. Cycle for trolling.

Sam’s had Duracell AGM at good prices. They are made by Deka. I got 6 years out of a set of Grp 31 on the trolling motor.

Downside is they are heavy. Really heavy.

How many cycles you put the battery thru is a factor in battery life.

Also have the Duracell's. Going on 5 years for me. Good battery.

this ^ ^ ^ deka is made in pennsylvania, best on the market imo. I had the regular deep cycle/dual purpose before going to lithium.

i got 2 interstate cranking, 2 duracell agm, and minnkota 4 bank 10 amp precision charger for sale.

I don't know what outboard you have. Check your outboard specs for minimum CCAs. Mercury Optimax require 1000.

Optima Blue Tops are Great for trolling motor.....not so much for cranking

I bought the X2 Power AGM from Batteries Plus and it’s great. Four year warranty as well.

I would not recommend the X2 as I had one and it was great for a couple of years and that was it....if you run today's big electronics, livewells, etc off cranking battery it is much more cost effective to go lithium......

Going on year 4 and it’s a beast.

So was mine

X2 is an over rated over priced POS....

Get Duracell agm batteries. Batteries plus has them with 30mo warranty and 10% off to a max of $30 off per day. Just buy one battery a day and use discount code to save the most. That what I did and saved about $90 buying 3 batteries over 3x days.

If you have room for large batteries get the agm 31M duracells 110AH 800cca 1000mca, you can troll around for 2+ days without a recharge
Or save $20 bucks and get the Duracell agm 27m 100ah 620cca,still pretty big batteries and can still last 2 days.

My trolling motor Duracell agm group 31M lasted 7 years, one is still technically good just only putting out like 460cca. I just replaced both batteries two days ago with new duracell agm 27m.
I had an Optima blue top 34m starting battery that was 11-12 years old, was getting weak, top plastic housing started cracking around terminal post and leaking acid and corroding the cables, was also replaced with a duracell agm 27m.
Optima are overprice and not made the same as they did 8+ years ago.

I don't know what outboard you are running but my Optimax owners manual states 1000cca minimum.

I actually have an old 1983 mercury black max 150 good old 2 stroke.

Mercury Optimax requires per manual. "The engine must use a marine starting
battery with 1000 MCA, 800 CCA, or 180 Ah rating"

marine cranking amps is not the same as CCA.