Restoring neglected batteries?

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Jun 6, 2005
49
Pearson 10M Tacoma
I bought a boat in April. It has 3 batteries, split into 2 banks. From reading other posts I realized boat batteries weren't the "no maintenance" variety that are used in cars (hey, I'm a rookie!). They're EverStart Deep Cycle "Trolling" batteries. Since the boat was for sale since last July, nobody's done anything to the batteries for a year. I just had to add 1 pint of distilled water to each battery. Amazingly, they've worked pretty well for me for the last 3 months. Is there anything I can do other than just topping up the water?
 
May 11, 2005
3,431
Seidelman S37 Slidell, La.
Batteries

I would recommend going to your local auto supply and getting a hydrometer. Check each cell to make sure none of them are bad. A bad cell in one battery can and will keep the entire bank from charging properly. Also would recommend that if one is bad, you replace all batteries in that bank.
 
Feb 26, 2004
23,328
Catalina 34 224 Maple Bay, BC, Canada
Charge them properly ansd they'll last longer

Craig do some reading on battery charging. use West Marine catalog or online adviosrs. download the Ample Power Primer at ""www.amplepower.com"" Stu
 

RichH

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Feb 14, 2005
4,773
Tayana 37 cutter; I20/M20 SCOWS Worton Creek, MD
Go to www.amplepower.com

Go to the amplepower website, then look for battery restoration and/or battery 'equalization'. Equalization is a special rapid charge at much higher than normal voltage which drives the sulfates off the plates, etc. Check with the battery manufacturer to see if 'equalization' is or is not recommmended. ;o)
 

Rick D

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Jun 14, 2008
7,203
Hunter Legend 40.5 Shoreline Marina Long Beach CA
See This Link Too

Trojan Battery Co. has a great resource for battery maintenance. Read about equalizing. FWIW, I was having some pretty bad battery crashes recently on my three and a half year old bank of golf carts. They get heavy use. Anyhow, before tearing them out, I checked them with a hydrometer which indicated little cell-to-cell varience. I then cleaned all terminals and also took everything apart at the switch panel and cleaned there too. I then equalized the batteries over night. Bottom line is that the batteries are fine. They have lost some of the capasity, but are perfectly satisfactory. Rick D.
 
Jun 6, 2005
49
Pearson 10M Tacoma
Post-Mortem

FWIW, here's the final results. I equalized all three batteries. Two then load-tested as "perfect" (according to the battery store), and the 3rd was garbage. So now I have a new starter battery and the other two are together as a house bank. Thanks for the advice. Craig
 
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