MX 5ND battery handling in winter during season vehicle

Hello together, I own a Mazda MX5 ND and have registered this as a season vehicle. Since I do not move the vehicle in winter, the battery should be “maintained” via a maintenance charger. Now there seems to be some special features with the ND 160PS motor mi I-Eloop / I-Stop technology. I asked two car dealerships for advice and received 3 opinions 🙂 – a recommendation from Mazda regarding battery maintenance is still pending. Can anyone give me a tip on this? Requirements: Vehicle is in the carport without power access, battery is not in operation from November to April and should be “peeled / spared”, so that it will not be discharged or damaged. Thank you very much!