Mine are huge and really heavy, so I leave them in and once a month I plug in my onboard trickle charger for a couple of days.
Ready to go in the spring.
You gotta keep them charged, if not the Neg plates start to rot.
~..~..~.. ><((((º>
Things done at the last possible minute are done with the greatest possible information. Procrastination is, therefore, the most efficient means of doing things.