New batteries question

badtothebones

badtothebones

Member
Oct 22, 2015
136
Florida
Boat Info
2015 260 Sundancer
Engines
ECT 350 MAG MPI BR3
Need to replace both batteries...should I get 2 "dual purpose " or one "starting"and one "deep cycle"?

Considering AGM batteries.

Other question how many amp hours?
 
What equipment do you run while on the batteries, and for how long? Do you plug into shorepower while at the dock?
 
Boat in hi and dry, shore power always while at dock.

When out typically 4-8 hours to sandbar, fishing, etc.

Just run basics, radio, gps, refrigerator....

Don't have generator.
 
I'm happy with all AGMs. Just make sure your charger/inverter is designed for AGM chargers. Some say it really doesn't matter but I wouldn't want to risk damaging expensive AGMs with the wrong equipment.
Cheers
 
Group 27 or 31. Dual purpose might suit you better on a 2 battery set up. Look for >900 MCA and 175 reserve. Interstate, deka brands are good.
Wet cell or Agm - your choice, but I prefer wet cell. I get Napa commercial batteries in group 31 locally for $80. They are over 1000 mca and 180 min reserve capacity. Made by deka.
 
Starting batteries are dedicated to short burst high amperage draw (loads) like those encountered during cranking. Dual purpose or deep cycling are designed for deep discharge (over and over) which starting batteries cannot tolerate. Consider your house bank and starting bank. Follow ABYC reccommendations based upon loads and total amperage draw.
 
Msauder123 said:
Starting batteries are dedicated to short burst high amperage draw (loads) like those encountered during cranking. Dual purpose or deep cycling are designed for deep discharge (over and over) which starting batteries cannot tolerate. Consider your house bank and starting bank. Follow ABYC reccommendations based upon loads and total amperage draw.
Click to expand...
Interestingly, was at the boat today and noticed it has 2 "cranking" batteries.
 
If you have 2 cranking batteries and you regularly deep discharge them, 2 years is about the expected life.

General expectations for batteries if deep cycled (these are just approximate guidelines):

Starting battery (Automotive battery etc) : 3-13 months
Marine Battery : 1-6 years
AGM Deep cycle: 4-7 years
Gel Cell Deep Cycle: 2-5 years
Flooded Lead Acid Deep Cycle Battery (L16-RE etc): 4-8 years
 
paulswagelock said:
If you have 2 cranking batteries and you regularly deep discharge them, 2 years is about the expected life.

General expectations for batteries if deep cycled (these are just approximate guidelines):

Starting battery (Automotive battery etc) : 3-13 months
Marine Battery : 1-6 years
AGM Deep cycle: 4-7 years
Gel Cell Deep Cycle: 2-5 years
Flooded Lead Acid Deep Cycle Battery (L16-RE etc): 4-8 years
Click to expand...

That makes sense then, not sure why boat came with 2 cranking batteries.

Today spoke with captain from dealer I bought the boat from who suggested I replace with 2 dual purpose batteries.
 
When I had my 2011 260 DA it only had 2 batteries and you can start from either battery.

You probably have a 4 position battery switch. 1, 2, Off, Both.

Run on Both. If on the hook for any length of time change over to 1 or 2 to keep a fresh battery to start.
 
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