Firstly, happy thanksgiving.
I need your help. Ive got a 1986 944 turbo. Its a 220 car with air con (although it doesnt work).
The battery has been playing up. It was fitted with an aftermarket lion battery.

My local spares shop tell me that a 60Ah battery is just fine.
The Lion battery i took out is a 71Ah and my mate with a 250SE car has a 78Ah battery in his car.

Which spec of battery is right for my car?
Can you put a 91Ah battery into the car without causing any troubles?