BMW 740i Car Battery Replacement Costs

Estimate price near me

Service Location

Customer Ratings

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

See availability

Customer Ratings

Car Battery Replacement Service

How much does a Car Battery Replacement cost?

On average, the cost for a BMW 740i Car Battery Replacement is $321 with $181 for parts and $140 for labor. Prices may vary depending on your location.

Car	Service	Estimate	Shop/Dealer Price
2000 BMW 740iV8-4.4L	Service typeCar Battery Replacement	Estimate$655.36	Shop/Dealer Price$786.75 - $1166.75
2020 BMW 740iL6-3.0L Turbo	Service typeCar Battery Replacement	Estimate$646.35	Shop/Dealer Price$773.27 - $1149.92
1995 BMW 740iV8-4.0L	Service typeCar Battery Replacement	Estimate$646.35	Shop/Dealer Price$774.69 - $1152.40
1993 BMW 740iV8-4.0L	Service typeCar Battery Replacement	Estimate$507.21	Shop/Dealer Price$600.77 - $874.12
2017 BMW 740iL6-3.0L Turbo	Service typeCar Battery Replacement	Estimate$646.35	Shop/Dealer Price$774.77 - $1152.54
1999 BMW 740iV8-4.4L	Service typeCar Battery Replacement	Estimate$646.35	Shop/Dealer Price$774.94 - $1152.83
2015 BMW 740iL6-3.0L Turbo	Service typeCar Battery Replacement	Estimate$646.35	Shop/Dealer Price$774.72 - $1152.45
2001 BMW 740iV8-4.4L	Service typeCar Battery Replacement	Estimate$646.35	Shop/Dealer Price$774.69 - $1152.40

Show example BMW 740i Car Battery Replacement prices

What are car batteries and how do they work?

A car battery is an energy storage device that relies on a chemical reaction within the battery to produce electricity. The stored electrical energy is used to initially operate the starter motor, ignition system, and fuel system on your vehicle. Once your car engine is running, the alternator supplies the electricity needed for all vehicle systems and charges the battery to replace the electric energy used when starting a car.

Most electric vehicles have a traction battery which is in addition to the standard 12 volt battery that is used to start the car engine. Traction batteries also convert chemical energy to supply electrical energy but operate at higher voltages and often are monitored by the PCM (Powertrain Control Module).

Battery

When to replace a car battery?

Your car doesn’t start. A new battery has a specified capacity to provide power. This capacity is referred to as the cranking amps rating of the battery. As a battery ages, the actual amps that a battery can supply becomes lower than its original rating Once the cranking amps fall below a critical threshold, it will be difficult or impossible to start your car.
Battery or charging system warning light is illuminated. Should a battery or charging system warning light illuminate, a mechanic should perform a few basic tests to determine if a battery replacement is needed.
Electrical components don’t work. Once a battery has started to fail, and the voltage produced by the battery drops, then vehicle electrical components can malfunction, such as the security system. If you are experiencing electrical malfunctions, it’s a smart idea to have the battery tested.

How do mechanics replace the battery?

A temporary power source might be installed to avoid the possibility of losing radio presets or stored data in the PCM while the battery is out. When the battery is already completely dead, this step is unnecessary.
The vehicle’s negative cable is removed from the battery, followed by the positive cable. The battery tie down system is loosened and the old battery removed.
Cable ends and wiring are carefully inspected to ensure cleanliness and no corrosion. In some cases, corrosion can be extreme and the cable may need to be replaced or wiring repaired.
The new battery is installed and the tie down system is reinstalled. Anti-corrosion compound is applied to the battery terminals. The positive terminal is reconnected followed by the negative terminal.
Some vehicles, for example some models of BMW, VW, and Audi, may require PCM programming to input battery parameters. This step, performed using a specialized scan tool, is necessary to maximize battery life and prevent electrical system malfunctions.
The car is started and charging system output is measured and compared against the factory OEM specification to ensure that the new battery will properly recharge. Generally, charging output will be in the range of 13.8 to 14.8 volts but the exact specifications vary by make and model.

Is it safe to drive with a battery problem?

Yes, but if you have a weak battery you might be left stranded somewhere if the battery dies completely and you cannot start your car. A faulty battery may also needlessly overload the alternator and could adversely affect the operation of the vehicle’s electrical system, including the vehicle security system and the shift interlock.

When replacing the battery keep in mind:

The quality of the electrical connections to the battery posts is important. Connections must be clean, free of corrosion and properly tightened.
Batteries store a large amount of energy and if short-circuited a battery could explode and can create intense discharges that can damage your eyesight. Insulated tools should be used to attach cabling to battery terminals. Otherwise, the battery’s positive cable can be shorted to ground or the positive and negative posts can be directly shorted. Batteries can only be safely installed from a positive terminal to positive wiring and from a negative terminal to body ground. If the polarity is reversed damage will likely occur to the vehicle’s electrical system.
Generally, a car battery will have a service life of 4 to 7 years. If a load test on a battery reveals a significant reduction in the capacity of the battery to provide power, you should buy a new battery rather than wait for the old battery to fail completely.
Batteries should only be disconnected if the engine is off and the alternator is not running. Disconnecting a car battery while the alternator is running can cause a voltage spike that will damage sensitive electronic components in the vehicle, such as the PCM.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee

Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

Excellent Rating

(3)

Rating Summary

3

0

0

0

0

3

0

0

0

0

SEE REVIEWS NEAR ME

Excellent Rating

(3)

Rating Summary

3

0

0

0

0

3

0

0

0

0

SEE REVIEWS NEAR ME

Recent articles & questions

Long Block vs. Short Block Engines: What’s the Difference?

Depending on the damage to your engine, replace it with a short block or long block engine if it’s less than the resell value of your car.

How to Find Out if a Car Has a Lien on It

Buying a used car (https://www.yourmechanic.com/article/how-to-buy-a-used-car) can be a tricky proposition. It requires a diligent search, test drives, and plenty of legwork to find the right car. One step that should never be overlooked is the search for any liens on...

How to Replace a Fog Light Relay

Fog lights assist the driver's visibility when driving in dense fog. Clicking sounds and malfunctioning lights are signs of a bad fog light relay.

Car sputtering at 55 MPH while accelerating.

I believe what you are experiencing is a misfire condition. Basically this is when one or more cylinders in your engine stop producing power due to a lack of fuel spark, or oxygen that is necessary for combustion. Generally your...

Hi. i have a 2000 kia sportage 4WD and it looks like the fuel pump needs to be replaced. Is it necessary to drop the fuel tank in order to replace the fuel pump?

Hi there. The fuel pump could be changed by using a special tool behind the seats in your vehicle. You will have to remove the carpet behind the rear seats and you will have access to the fuel pump. I...

Is my 2011 Peugeot 508 have timing belt or a chain belt

All engines used in the Peugeot 508 (there were at least two engine options) use a timing belt, not a chain. YourMechanic offers mobile (at your location) replacement of the timing belt and related components, including the tensioner and idler...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com