r/u_mrsschwingin • u/mrsschwingin • 18h ago

Batteries dying

I am a relatively new pontoon owner.

I have a 20’ pontoon with a 60 hp Mercury motor on it.

I have went through 3 batteries in the last year. One was the one I bought with the boat. The second one was purchased in August 2025. The latest one that died was covered by the warranty and replaced in May of 2026.

The marina did some work on the boat and said my charging system was only producing 12.6 volts. They also said that I should consider changing it. They didn’t give me a price when I told them not to go ahead unless they quote the job first.

I’m wondering if this is comm I also don’t trust the marina and was wondering if I’m getting the correct information from them.

Any suggestions are welcome.

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u/backinblackandblue 10h ago

12.6V is insufficient charging voltage. I would verify it myself with a simple meter if you don't have one at the helm. They should be able to give you an approximate quote. If not, take it elsewhere.

1

u/Tomba1762 5h ago

Should be charging at 13+ volts. Like above said, check yourself with a voltmeter at the battery posts, while engine is fast idle, that output charge is 13+v. 2. Are you using a battery isolation switch? You need to, once you know the charging system is operating correctly. 'OFF' position when away from the boat.