Where is the battery located in the 2014 Mercedes Benz SL 63 AMG?

This blog will answer the following questions: where is the battery located in the 2014 Mercedes Benz SL 63 AMG? How to replace the battery in the SL 63 AMG? What are the specifications of the 2014 Mercedes SL 63 AMG? Does the 2014 Mercedes SL 63 AMG have an auxiliary battery?

Where is the battery located in the 2014 Mercedes Benz SL 63 AMG?

The battery of the 2014 Mercedes Benz SL 63 AMG is located in the middle of the trunk. It is covered by the floor panels in the trunk, no tools are required to remove the panels but basic tools are required to remove the battery.  The capacity of the main battery is 12 V 95 Ah and it is secured by a belt strap to the floor.

Mercedes Benz uses AGM or absorbent gel mat battery in the SL 63 AMG. It is a maintenance-free battery as the absorbent mats inside an individual cell contain the electrolyte. 

A battery load tester is required to check the condition of the battery. It is not possible to determine the condition of the battery by hydrometer. There are no maintenance caps on top of the battery, a vent hose is provided on both sides of the top cover of the battery.

The vent hole has connected the hose which carries harmful gasses and liquid away from the battery. The outlet is protected by a rubber gourmet and it opens under the car.

The main battery costs around 250-280 USD and dealerships can charge additional labor to replace the main battery. 

Mercedes Benz can replace the main battery under the standard warranty which lasts for 3 years. Extended warranty plans do not cover the cost of a new battery and the labor cost associated with it.

However, if the customer pays for the new battery; Mercedes Benz also provides an additional 2 years of spare parts warranty provided the vehicle is driven after replacing the battery. Warranty claims can be rejected if the vehicle is scarcely used.

How to replace the battery in the SL 63 AMG?

The procedure to replace the battery in the SL 63 AMG is given below. Always wear protective gear like safety glasses, rubber gloves, and ESD-proof shoes while removing the battery.

  • Turn off the ignition and unlock the trunk. Remove the key from the ignition switch and store the key at least 2 meters away from the vehicle.
  • Open the trunk, and take the spare wheel and floor panel out. Disconnect the negative terminal of the battery and place it to the side.
  • Unscrew the bolts of the bracket and undo the strap securing the battery to the floor.
  • Disconnect the positive terminal and the vent line and take the battery out of the trunk
  • Install the new battery and connect the positive terminal before connecting the negative terminal. This practice ensures there are no electrical short circuits.
  • Check if the battery is properly installed and sacred to the floor. Connect the vent line to the left side of the main battery.

If the battery of the SL 63 is completely dead then the trunk cannot be opened by the remote key. Take the mechanical key out of the remote key and insert it directly into the trunk lock to open the trunk.

Alternatively, open the engine hood and connect a battery charger. The battery charger can temporarily power the onboard electrical circuits to open the trunk. 

Connecting a charger while replacing the main battery is optional but it can ensure the control units will not lose the user data. In some cases, normalization of the power windows must be performed after replacing the main battery.

What are the specifications of the 2014 Mercedes SL 63 AMG?

The specifications of the 2014 Mercedes Benz SL 63 AMG are given in the table below. The SL 63 model series R231 was manufactured between 2012-2020.

Specifications 2014 Mercedes Benz SL 
Engine output577 Horsepower 900 Nm torque
Transmission 7 G Tronic plus (7 speed automatic)
Top speed155 Mph/ 250 Km/hr
0-62 MPH4.2 sec
Fuel consumption (combined)24 MPG
Wheelbase 258.5 cm
Width 187.7 cm
Height 130.0 cm

The 2014 SL 63 AMG was powered by a hand-built M156 engine. The displacement of the engine is 5.5 liters and there are two turbochargers, one for each bank. Mercedes Benz had improved the reliability and the built quality of the M156 engine till 2014.

It was used in all the 63 series models; the only difference was in the displacement of the engine. The SL 63 AMG weighs only 1845 kg, and the power-to-weight ratio is 3.2 kg per horsepower. 

It also has an active body control suspension system, a hydraulic pump connected to the crankshaft by a poly V-belt generates the pressure required for the hydraulic struts.

There is no need for conventional anti-roll bars as the hydraulic struts can negate the body roll when the SL 63 AMG is cornering.

Power steering is also hydraulic with a rack and pinion setup. As the SL 63 is larger than the SKL the handling is not very impressive. There is understeer and the car cannot rotate mid-corner due to its heavy weight and lack of rigidity.

The Vario roof mechanism uses electrical motors and hydraulic cylinders to fold and unfold the hard top, there is also a Magic sky in the glass once the hard top is in the closed position. 

The 7 G Tronic automatic transmission has an additional auxiliary pump and the gear shifts are quick compared to the standard 7-speed transmission.

The dimension of the front and the rear wheel is different as the SL 63 AMG is a rear-wheel drive car. In the front, there are 255/35 R 19-inch tires and in the rear, the tire is 285/30 R 19. 

The brakes are also huge, the front discs are 390 mm and the rear discs are 360 mm in diameter, both are ventilated discs for maximum cooling.

Does the 2014 Mercedes Benz SL 63 AMG have an auxiliary battery?

Yes, the 2014 Mercedes Benz SL 63 AMG comes with an auxiliary battery. It is located behind the driver’s seat. There is no need to remove the driver’s seat in order to remove the auxiliary battery.

The capacity of the auxiliary battery is 12 Volts 200 Amps and it is used only when the engine is automatically turned off in the ECO or engine cut-off mode.


As the main battery is located in the trunk, the battery life is not compromised due to high temperature and it can easily last for 4 years. Keeping the ignition ON for too long discharges the main battery and if there is a parasitic drain, the battery will be completely discharged.