Northeast 25 O'day Owner
Join Date: Jul 2006
Location: Salem, MA
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yet another battery question
I've been following battery based threads here for a while as I worked on my own challenge.
I've added a fishfinder and GPS (Garmin 440) to my 25' O'day and the fishfinder has a voltmeter built into it so I'm able to monitor my system's charge for the first time.
After a few sails this year and a few electric starts of my outboard my battery quickly dropped from 12.8v to 12.2. I ran my motor for a good thirty minutes on a light wind day to charge it up but only saw it gradually raise to 12.4/12.5.
I purchased a smart-charger 3 stage charger based on forum recommendations and it safely and quickly charged my 1 year old class 24 (70 amp/hour) multi-purpose wet-cell battery up to full charge again.
This weekend we went out and I monitored the battery as one start of the 15 hp Evinrude O/B motor dropped the charge again from 12.8v to 12.5.
Is that normal? Is my battery toast? Under-rated for the job?
I am planning my first week long trip on the boat and I feel like I should get this worked out prior to departure... my manual pull-start died recently and the electric start would be my only route during this trip. (writing this has prompted me to call to get the pull-start repaired prior to departure as well... better safe than sorry)
Anyway, I was planning on adding a second battery and switch this week as well, but I'm not sure if I should ditch this battery entirely and go with two specific types - starter/house, instead of this "multi-purpose" that seems to have about three engine starts in it.
Thanks, as always these forums and their archives are my main and most reliable source of education.
1976 25' O'day - "SeaWind"
Hello Sailor: "I've just learned that good boats, in good hands, are damned robust creations."