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In the 2003 BMW 745li, the battery is not located where you might expect it to be, which can make it challenging to locate. Unlike most cars where the battery is found in the engine compartment, in this BMW model, it is actually situated in the rear trunk. This unconventional wiring setup may confuse some Americans, so it's important to understand this setup. To reach the battery, you will first need to open the trunk, access the spare tire compartment, and then remove the spare tire. The battery is conveniently placed on the right side of that compartment. Accessing the terminals may be a bit tricky due to the tight space, but with some careful maneuvering and a bit of luck, you should be able to remove it without much difficulty.
You can locate the battery in your 2003 745i on the right side of the engine under the hood, positioned alongside the firewall of your car.