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Old 06-08-2020, 12:56   #1
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Join Date: Mar 2019
Posts: 10
Warm battery

Two batteries #1 cool #2 warm
Conditions. Solar charger. Output of solar panels unknown. EST size 18x36in. 20 yrs +old. Flexcharger regulator, 20+yrs old. All have been working ok. Batt for house loan only. No starting lode.
Voltage at solar charger “out to date 12.8v
Voltage at batt 1+2 14.9v at ea batt.
Batt #1 cool to the touch.
Batt #2 warm to the touch
Water in both batt ok
Presume that batt#2 is faulty and should be replaced.
Comments ??
Thanks. Nick
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Old 06-08-2020, 13:12   #2
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Join Date: Nov 2013
Location: Nice, France
Boat: Hunter Marine 38
Posts: 936
Re: Warm battery

Yes, should be replaced, it will heat up more and more with time.
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Old 06-08-2020, 13:33   #3

Join Date: Jul 2020
Location: Depends on the month
Boat: 32’ Sloop
Posts: 266
Re: Warm battery

I have noticed this with one of my batteries as well, 3mo old AGM, it sits on a charger 24/7 while at dock.
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Old 07-08-2020, 06:46   #4

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Join Date: Nov 2019
Location: South Carolina
Boat: Philip Rhodes Custom 71'
Posts: 103
Re: Warm battery

Quick check is to feel along the side of the battery. If one cell has gone, that area will be at a higher temperature than the rest.
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