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krc



Joined: 06 Nov 2017
Posts: 113
City/Region: SF Bay Area
State or Province: CA
C-Dory Year: 2006
C-Dory Model: 25 Cruiser
Photos: krc
PostPosted: Wed Jun 01, 2022 5:36 pm    Post subject: House battery Reply with quote

I noticed that interior lights would only stay on when the charger was on
(hooked to shore power). Strange. Getting 13.6 volts or so at the house battery with charger on (original Guest) I believe. House battery is a 24DC-140 from Alliance. When charger is off, voltage would float down and settle around 5-6 volts so I think that is a good indication the battery is toast.
It is a lead acid battery and frankly I haven't been checking the water level - would that perhaps recover the battery at all? Or is it just best to replace in the interest of time... the battery is at least 5 years old and I usually just replace at that age.

Next question - should I go with AGM? Are those compatible with the original guest chargers? Or just stick to the same battery? Recommended brands/where to buy?
Thanks.
K
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thataway



Joined: 02 Nov 2003
Posts: 20778
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
PostPosted: Wed Jun 01, 2022 7:23 pm    Post subject: Reply with quote

Replace the battery. Next time around check the battery water each time you go on a major trip and ever couple of months. If you leave the battery hooked up to the charger, it may boil the electrolyte off. The factory charger is not really a "smart charger". There are chargers which sample the voltage, and then apply a charge if the voltage is below a certain place.

You were just getting the voltage of the battery charger when you tested.

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Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
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kaelc



Joined: 19 Jul 2017
Posts: 411
City/Region: Saanich
State or Province: BC
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: Island Magic
Photos: Stil-Afloat
PostPosted: Thu Jun 02, 2022 10:56 am    Post subject: Reply with quote

I went with an energizer 31 agm and replaced the quest charger with a Victron. I just feel more confident with my batteries being agm.
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Dreamer



Joined: 01 Jan 2006
Posts: 1763
City/Region: Really Sunny SaddleBrooke
State or Province: AZ
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PostPosted: Thu Jun 02, 2022 1:40 pm    Post subject: Reply with quote

We saw the result of letting a battery run dry and the charger left on recently. This was on a Golf Cart down the street. The house fire destroyed most of the house!
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Once a C-Brat, always a C-Brat

Dreamer- Sold 25 Feb. 2013
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