Need new starter battery

[captpierre]

After 15 yrs might be time to replace my 24M Deka starter battery.  Since I got my Terrova with spotlock I use the Yammy 115 less to move around the weedbeds and with the Lowrance graph on for 3 hrs, I noticed the motor didn’t turn over as quick for the ride back to the dock.   Can’t seem to find another Deka around. 
Are marine cranking batteries different than automotive batteries? 
Is this one any good? Rated fairly well. 

[CrowMan]

I'd go with an AGM type battery for the starter. Lots of advantages over a traditional lead-acid. 

You can buy them at CT.

[captpierre]

Reading about dual purpose lead acid batteries 
Marine  cranking amps 675.  Better for electronics  drain.

Half the price of AGMs. 

[misfish]

Grab the Nautilus. Never had an issue with them when I had my boats. Enjoy the rest of the season.

 

[CrowMan]

The Nautilus AGM's are on sale at CT right now . Will last longer than lead-acid, lower self discharge rate, faster charging, more cycles, no maintenance and longer warranty.  Like a lot of things, you get what you pay for..

 

[KraTToR]

+1 on the AGM but i've had great luck with flooded as long as you keep the electrolyte levels and charging in check.

Doing the math, the AGM costs over 2x as much so the little bit of extended life doesn't make financial sense. Move up to the group 27 if you have capacity concerns.

If you don't have one, i'd move up to a 2/3 bank charger rather than go to an AGM.  PM me if you req. details.

Any yes, marine batteries are different than automotive.

 

[BillM]

Find a Total Battery and buy AGMs from them.

[Lape0019]

Only thing that matters in your case is how long you can stay out on the water while running your graph and anything else. But... 15 years is exceptional use out of your DEKA. 

You want to look at the Amp hour or reserve capacity limits. Most RC is calculated at how many minutes a battery will last at a 25 amps. The higher the number, the longer it will last. 

So a group 31 nautilus at 130 RC will last you a lot more time on the water over the 90 RC of the group 24. I mentioned this because there is no way you are drawing 25 amps from that battery at any given time. 

[BassMan11]

Get the largest starting battery that will fit and you can afford. AGM is recommended as well. Getting 15 years out of a battery is crazy and shows you have good charging practices. 

[captpierre]

Thanks Gents. 
I think I’ll pick up the larger 27M dual purpose Nautilus lead acid. 
I feel if I go to AGM, I might as well go lithium for not a lot more. 
 

[captpierre]

[CrowMan]

Lithium is not really great as a starter battery. Lithium is better as a deep cycle for your trolling motor.

Do you plan to use the dual purpose for your trolling motor too ?

[captpierre]

No my friend.  Main engine, graph, master switch and down riggers. 

[Terry]

Make it simple get a 24 or 27 group size regular starting battery there are only a few manufacturers so buy a less expensive one if you can 

[AKRISONER]

i did the ground work and research for you already.

You seem to be very happy with your east penn Deka battery...well guess what? You're in luck...Canadian Tire Nautilus AGM's...are you guessed it, East Penn Deka batteries private labeled for canadian tire!