Dual Battery Replacement

[smokeonthewater]

You can ALSO just get marine dual purpose batts

Robust enough for starting and still more tolerant to deep discharge than a standard starting batt.

Look at what you are cranking... Do you NEED 1000 cold cranking amps to start a 25, 50, 100, or whatever hp outboard in say 60-90* or whatever temps you boat in.

For reference my 4.0L jeep takes a little over 400 amps to start at 80 degrees and my dually w a 7.3 Powerstroke diesel takes @750 amps at the same temp.

Edit: Ferm and I were typing at the same time.

[SkunkBoat]

one grp 27 dual purpose is all you need for an outboard, ff,gps, vhf, bilge & running lights as long as it is less than 5 or 6 years old.
if its older, get a new one.

Carry a jump starter battery if you want to be extra safe.( they only last 5 years too)

[bjrrockwell]

Thanks for all the great advice! Since its already a dual battery setup I'll most likely stick with that. I'll look into the dual purpose. I know on some of the colder mornings (38-44 deg) the batteries I currently had were struggling to turn the motor over, however they are 5 and 7 yrs old so they're overdue. But again appreciate it, great forum to belong to!

[smokeonthewater]

you can always switch to both for cranking

[spareparts]

dual purpose do neither job well