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Hi Francesco The Marelli starter motors would start the cars OK it is just that they would draw massive amounts of amps starving all the other stuff of power and draining batteries causing all sorts of strange issues until the battery is recharged which could take 10 to 15mins Regarding the Battery fitting an oversize/rated battery is a myth, often the alternator can't fully charge the battery this can result in the battery failing early. Large capacity/fast recovery batteries are often specified for cars with stop/start facility, these cars also have a beefier charging circuit yours doesn't have that. Your battery should be something like 12v/85 to 90Ah/800 to 900 cca (Cold Cranking Amps) ECP had an offer on over Easter Bosche Battery's were less than £100 delivered even Halfords should be around £120. As an example my X5 E53 4.6is needed a new battery in November last year I brought a Yuasa 12v/110Ah/900CCA battery from a local motor factors £129. FYI a fully charged battery should read 12.8 v engine off, around 14.8v engine running, anything below 12v indicates a discharged or dying battery or suspect charging system. Dave