Battery winter storage

JNorton wrote:
Flooded lead acid batteries self discharge between 4 to 6 percent per month with discharge rates diminishing with lower temperatures. Typically a fully charged battery will suffer no ill effects being disconnected for winter. If you do choose to use a float charger use a holding relay to disconnect it from the battery in case the power fails. Make sure it is a float charger rated for your battery type. https://en.wikipedia.org/wiki/Float_voltage

Disconnected, that battery maintains its voltage by eating its plates from the inside out. You're welcome to believe otherwise, but I would encourage you to learn more about how batteries work and maintain voltage between charges. A float charger maintains proper voltage and allows batteries to last a lot longer, particularly when not being recharged by an alternator with regular use.