Probably a stupid Battery Question.....Tender over winter storage

[2kwik4u]

I suspect this has been covered before, but every time I search I find all kinds of answers for very complex systems.

My boat ('17 AR190) has a VERY simple electrical system. A single battery and a single on/off switch. The only thing I've added is a soundbar on the tower, and it's wired into the switch as well so It's power is cut when the switch is off. Even my bilge is not powered when the battery switch is off. Zero load on the battery.

For winter storage, in years past, with past boats. I've pulled the battery, stored it on a wooden shelf in the basement to prevent freezing, and recharged and reconnected in the spring.

This year, and for this boat. I have a battery tender, and the boat lives in the garage. Garage temps rarely fall below freezing in the winter here, and if they do it's only for a day or two at a time.

Is there any reason I can't leave the battery in the boat, connected, with the tender on it all winter? There's no load. It's not on concrete, and I have the tender clipped to the posts with good results. Am I missing something there? Any reason I should disconnect or remove it?

 

[Neutron]

Here is a good read. Should answer your questions
Battery storage

As long as your charger is automatic it will be suitable

 

[grywlfbg]

No problem at all to leave it in. The freeze point of a lead acid battery when fully charged is -92F.

 

[212s]

No issue leaving the batteries in the boat as long as the charger is smart - electronics monitor the state of charge and tops up when needed, then turns charge current off till it's needed again. If it's placed or mounted in the boat, ensure it's ignition protected so fumes will not be ignited when it turns on/off to keep the batteries topped up. I have a Promariner smart charger and intend to leave it plugged in 24/7 over the winter. Boat is stored in my driveway under a cover.