Mazda CX-5 persistent dead battery issue after sitting for 10 days despite multiple replacements on Mazda CX-5

Some Mazda CX-5 owners report experiencing persistent dead battery issues even after multiple replacements, particularly when the vehicle sits for 10 days or longer. These problems often manifest as slow cranking, which can indicate a failing battery and lead to difficulties starting the engine. Reports of ongoing battery drain and parasitic draw issues have been noted in Mazda CX-5 models, including up to the 2023 versions. In some cases, a parasitic draw occurs when an electrical component continues to draw power while the vehicle is off, exacerbating battery drain. Owners are advised to check for faulty electrical components that might be draining the battery and to consider potential malfunctions of the Remote Tuner module, which Mazda has acknowledged as a concern in certain models. To address these issues, it is recommended to have a professional mechanic inspect the vehicle for underlying electrical problems, check the Remote Tuner module's condition, and consider installing a battery disconnect switch to prevent parasitic draws. Regularly driving the vehicle or using a battery maintainer can also help keep the battery charged during periods of inactivity.