Where is the negative terminal of the BMW 740 battery?
3 Answers
After removing the positive terminal, lift the cover to reveal the negative terminal. BMW 740Li: The BMW 740Li is a high-end luxury sedan produced by German automaker BMW. It belongs to the "BMW 7 Series" and is exclusively manufactured in Germany. The new 740Li is equipped with a 4.0-liter V8 engine, delivering a maximum power output of 225 kW and peak torque of 390 Nm, capable of accelerating from 0 to 100 km/h in just 4.6 seconds. Automotive Battery: The battery is an essential component of a vehicle, categorized into traditional lead-acid batteries and maintenance-free batteries. Since the battery uses lead-calcium alloy for its grid framework, it generates less water decomposition during charging and has lower water evaporation. Combined with its sealed structure, it releases minimal sulfuric acid gas. Compared to conventional batteries, it offers advantages such as no need for liquid replenishment, secure terminal connections, and extended power storage duration.
The negative terminal of my BMW 740's battery is located under the floor mat on the right side of the trunk. After lifting the felt cover, you can directly see the battery pack. Opening the black plastic protective cover reveals the terminal, which is clearly marked with a negative symbol. A friendly reminder: some people might mistakenly think the metal grounding point in the engine bay is the negative terminal, but that's actually just an auxiliary connection point for emergency jump-starting. When replacing the battery yourself, remember to follow the correct sequence: first turn off all power in the vehicle, disconnect the red positive cable, and then remove the black negative cable. During installation, connect the positive terminal first, followed by the negative terminal, to avoid damaging the circuit modules. By the way, the fire extinguisher and emergency tools in the trunk are placed right next to the battery, so it's a good idea to check these items while you're there.
The negative terminal of the BMW 740's battery is actually quite easy to locate – it's in the trunk. Open the trunk and look on the right side, lift up the floor mat, and you'll find a plastic cover with clips. Remove it to reveal the battery, and the black cable is connected to the negative terminal. I just helped my neighbor with this last week and noticed the space is a bit tight, so I recommend using a flashlight for better visibility. Important note: always disconnect the positive terminal first, then the negative, and the same applies when jump-starting. Also, be aware that high humidity in the trunk can cause terminal oxidation, so it's advisable to check the connections every six months. When the battery is nearing the end of its life, you might notice delayed engine starts or weaker air conditioning performance – that's when you should consider replacing it.
