Store the batteries inside....
.... at a good charge.
I had mine stored in the garage until a month ago, and when I went to check on it, one battery had dropped to below charging level. I had to surface charge it before the on-board charger would recharge it.
The consensus is to charge the batteries fully, then glide for about ten minutes, then remove the batteries and store them indoors. That's what I did, and now I am monitoring their voltage on a weekly basis to insure no surprises.
My garage is heated to 32° F all winter. Mine is an XT with Li-ion batteries.
Dennis
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