Winter battery storage

Simple answer to this one......
Fully charge batteries and disconnect.

Been doing it for 5+ years here in New Hampshire & never had a problem. If a battery get's discharged it will freeze & it's then HISTORY.

I would put them on a maintainer while in storage.

When I owned trailers I took the batteries out and stored at home. Checked voltage each month and charged if needed.

With the motor-home (since 2006) stored in a lot without shore-power, I added two 9-watt solar panels. One for the chassis battery, and the other for the pair of T-105's house-battery bank. The panels do not require a controller and are connected 24/7. In the winter they are moved down from the overhead bed window to the dash panel since over-head bed keeps snow off the windshield.

I check the MH once every month to check batteries with a multi-meter to note state of charge, and run the generator, and engine to exercise them. The original batteries lasted 9 years (chassis) and 10 years (house) on the 2003 MH.

Note that the batteries only get charged otherwise when plugged into shore-power if camping on an electric site, or using the generator. This type of usage obviously did not cause early demise of batteries.

I do monitor charging with a clamp-ammeter for amp-rate, and voltage (at the battery-terminals) to insure all charging methods are working; converter/charger, alternator, and solar-panels.

If batteries are sufficiently charged they will not freeze in cold weather. Also; cold weather storage is much better than hot weather storage as mentioned in an early reply.

As long as the wet cells charge is maintained there is no worry of freezing. Just maintain it the same as if it were summer.

I have mine plugged in and have a Battery Tender on the house battery and a trickle charger on the chassis battery.

Fully charged batteries don't freeze until -70 to -90 F.

To me its a matter of where you are storing it for the winter. If its somewhere that you can keep it plugged in then leave the battery in. I have always left mine in, with unit plugged into 110. If you have to store it unplugged then remove.

Fully charged AGM's will make it through our MN winters, FLA, nope. Take your FLA out and store it in the garage fully charged and hooked to a trickle charger. If your garage is unheated, run the trickle charger on every payday for 24 hrs. You'll find out the correlation after a few years.

Remove it, wash it down with a water/baking soda solution, bring it inside, and put a trickle charger, or better yet a maintainer on it once every month or so. Some maintainers can be left on indefinitely.