I can't imagine the charging system on the car being any different, regardless what battery is fitted. Being a 1991 car, I suspect it started out life with just a bog standard sulphuric acid battery and the gel battery fitted at some point in the future.
As to the battery freezing. I think you're unnecessarily worrying. Cars are left out in all weathers, on old airfields (by car manufacturers), drives, etc. 3 months is nothing.
Alternately, take it off the car and store in the garage. Charge when you think it necessary.
Last edited by: VxFan on Fri 16 Oct 15 at 09:53
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