I was told many years ago to always install the biggest physical battery that the car will take and to ther best quality. Done this in my cars ever since and rarely have a problem unless they have been standing for some time. Currently they all either get a run to the shops or tick over for 30 mins now and then.
My big diesel will be more problematic when normality returns. The batteries date from June 2008 and are coming to the end of their lives. There are 12 batteries each with four cells. Each battery is roughly a 15" cube and weighs a considerable amount. My cheque book will groan when replacements are paid for - possibly next year!
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