So, this has been mentioned before, buried in threads. The M40i does not have a second battery.
On the right side there’s a space under some trim in the engine bay, enough to hold a battery. I believe other models (euro models?) have a battery, there. There was some discussion regarding the purpose, and effectiveness.
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2022 BMW Z4 M40i | 2021 HD Road Glide Limited | 2019 Ford Expedition XLT MAX | Subaru Outback 2019 | Subaru Outback 2024
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