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  #1   IP: 99.242.78.154
Old 09-23-2019, 09:53 PM
hard aground hard aground is offline
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Start Battery

Just curious on thoughts about the smallest size/current start battery for an A4 powered boat. Presently have a group 24 that won't hold a charge to save it's life. Literally.
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  #2   IP: 137.200.32.54
Old 09-24-2019, 08:32 AM
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My start battery is a U1. It is about 30 AH and I can pick it up with one hand. It is getting old and has a hard time with cold starts now. A group 24 is plenty big to cold start an A4, so it might be the path of least resistance to just get another one.
FYI - the A4 draws about 120-140 amps when starting.
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  #3   IP: 67.176.201.200
Old 09-24-2019, 03:37 PM
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As I have gotten older and harder to wield batteries in and out of tight spces I switched to Optima AGM marine Blue top batteries., D27, can easily handle with one arm. Each battery is about 10;bs lighter than lead acid counterpart, can operate at any angle, handle vibrations etc. Costs about 3 times as much but I have one still going strong after about 11 seasons.
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  #4   IP: 138.207.175.104
Old 09-24-2019, 03:51 PM
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+1 on the Optimas.

Bill
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  #5   IP: 71.38.107.125
Old 09-24-2019, 07:28 PM
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+2 on the Optima
Been using them since '09 with great results.
One of them is 10 years old and still kicking.
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  #6   IP: 32.211.28.40
Old 09-26-2019, 10:16 PM
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A group 24 is all you need. If your Gp 24 isn't holding a charge, get it off the boat and try it again. If it holds a charge off the boat, you have a boat problem rather than a battery problem. Then again, batteries do die.
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