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AGM dead |
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Lhsrris218 
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Joined: 26 September 2021 Status: Offline Points: 108 |
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 Topic: AGM deadPosted: 13 November 2025 at 19:03 |
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Hi
Boat was on the hard for hurricane season. All battery switches were off for engine and house. Came back and everything is dead. Engine battery at 5v, house at 5v, thrusters are good at 24v Tried to charge the Engine battery- wont gi past 5-6 volts. Same with house. Are these defective? I can see them discharging passively to 10-11v but 5? Not sure if any will be salvageable - replaced the Engine battery so I can get in the water and to my slip Any advice? Any warranty? Boat laun ed last December Thanls
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marsella
Rear Admiral 
Joined: 21 June 2022 Location: Antigua Jolly H Status: Offline Points: 592 |
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Posted: 13 November 2025 at 20:13 |
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Those switches dont disconnect batteries completely, there are some elements of the circuits that are kept alive therefore if you leave the boat for a longer period either use a solar panel or wind generator to charge them. You can also hire a boat manager who will plug your boat into shore power once a month or so. Very easy in Caribbean, cost about $60/month. If you want the batteries to be competely disconnected, detach the red cable from them.
Edited by marsella - 13 November 2025 at 20:15 |
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Lhsrris218
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Joined: 26 September 2021 Status: Offline Points: 108 |
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Posted: 13 November 2025 at 20:39 |
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Any idea if they can be recovered?. I thought the blue sea remite disconnect would also prevent them from getting too low.
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marsella
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Joined: 21 June 2022 Location: Antigua Jolly H Status: Offline Points: 592 |
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Posted: 13 November 2025 at 20:55 |
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Those AGMs hate to be completely discharged, if you tried to charge them back and they did not pick up the charge, likely they need to be replaced. Even if they would show some life, I wouldnt gamble going out sailing if there is a chance they will die somewhere in the middle of nowhere.
I had similar experience when my boat stayed in Greifswald for several months waiting for me, but at that time the dealer didnt transfer the ownership to me and they had to put brand new batteries when I arrived
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Andiroo
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Joined: 23 July 2025 Location: Perth Status: Offline Points: 26 |
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Posted: 08 December 2025 at 06:44 |
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Hi I managed to recover 1 of 2 AGM 160 ah batteries which were both drained to around 6V.
I connected the depleted battery to a healthy charged 12 volt battery (car starter battery) and then connected the battery charger to the healthy batteries terminals. This allowed the charger to charge without error. Left overnight and voltage of AGM battery had moved up to about 10 V. Now I connected the charger directly to the AGM and left it for over 1 day. It reached 12.6 V and has held that charge for past two weeks. I tried this on my other AGM battery and this didn't work, never charged properly. Good luck Andrew Atomic Blonde Hanse 415 Fremantle Sailing Club
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