Winter battery storage ?'s

[SkiTundra]

I have generally not been very organized on this so hoping to correct that this year. Altogether I've 11 full size and 3 PWC/Motorcycle batteries to overwinter.

Best charger / maintainer? I've generally used Ctek (2200, MXS 5.0, MUS Polar). I believe these do as well as maintainer as Tender or other options?

What has been your experience maintaining two to four batteries per charger? E.G., connected in parallel vs rotating every few weeks vs something else? I assume if connected in parallel that they should each first be fully de-sulfated/reconditioned and fully charged, then connected in parallel for winter maintaining?

Issues with keeping batteries and maintainer in cold / sub-zero temps? The polar is specifically designed for this but not sure if it's still not better to haul them up to my garage.

Use to be a thing to never leave a battery on concrete, is that still a thing?

Other recommendations?

Thanks,

[Scooter G]

Multiple ways to skin a cat, but I went to the NOCO system a while back. Mostly for convenience with too many batteries to keep track of between toys and equipment. I've hard wired everything so I just plug the units in to the harness on each rig. I bought a stack of them and just do a multiple on going rotation between rigs, it sounds like a process but it's just an easy routine. They have a decent line up to choose from to meet your preference. Not affiliated, just needed something that worked for me. Of coarse the boat has it's own on-board system, so no worries there, just have to remember to plug it in.
Concrete? Old habits die hard, I still put open batteries on a block of wood, even if you told me otherwise.
Just my 2 cents.

https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1

[BasaltRMK]

FWIW, I pull my batteries and put them in the garage (heated) and on a trickle charger (BatteryTender), one at a time for a week or two at a time each. My boat is stored at my dealer inside but unheated, and no accommodation to plug in the built-in battery maintainer. I put the batteries on a carpet scrap, but just because it's there as opposed to worrying about them being directly on the concrete. Is concrete an issue? Tell me more...

- bob

[Scooter G]

I think old school was different materials in the casing than with today's batteries. Concrete would drain them down more rapidly. Really not a thing today. But again, old habits...

[MN Ryan]

Charged, disconnected, and left in the boat for me, but I have heated storage. May change next year as my storage guy sold his facility.

[XBIGPUN66]

I keep them in the basement on a shelf. They get charged and conditioned in spring.

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[BasaltRMK]

Interesting about the concrete, I'd never heard that one. I have a feeling a Wikipedia / YouTube rabbit hole is in my future...

- bob