I live in a cold climate (northern Canada) where temperatures now are already -20C during the day.

I have a 2007 Ford Fusion SEL 3L which doesn't get driven much and is parked outside, without a possibility to plug in.

The battery keeps constantly freezing/breaking due to it not being charged enough so I wanted to replace it with an AGM battery to get some more life out of it.

Trouble is that the battery is group size 96R, which is apparently a very odd size because there are no manufacturers that make AGM batteries in that size.

96R seems to be 9 9/16" x 6 13/16" x 6 7/8"

What would be a good alternative size to look for?