Find the Correct Battery for Your BMW 4 Series
The BMW 4 Series covers several distinct body styles, including the two-door Coupe, the five-door Gran Coupe and the Convertible. Although these vehicles share the same model family, their battery requirements can differ according to engine, production year, electrical equipment and whether the car is fitted with automatic Start/Stop.
Use the BMW 4 Series battery finder above to select your year, engine and fuel type. The finder will display suitable Lucas replacement batteries matched to the vehicle information selected.
Do not choose a replacement using the model name alone. A 420i Coupe may not use the same battery as a 420d Gran Coupe, an M440i or a plug-in hybrid version.
Coupe, Gran Coupe and Convertible Battery Differences
The 4 Series was developed as BMW's more style-focused alternative to the 3 Series, but the range now includes vehicles with very different practical and electrical demands.
The Coupe generally has two doors and a sporting layout. The Gran Coupe adds rear doors, a large tailgate and more convenience equipment, which can increase the electrical load placed on the battery when the vehicle is parked or used for repeated short journeys.
Convertible models also rely on electrically operated roof mechanisms, additional sensors and control modules. A weak battery may still start the engine but struggle to operate the folding roof reliably, particularly during cold weather or after the vehicle has been left unused.
BMW 4 Series Generations
The first BMW 4 Series appeared in the early 2010s and included F32 Coupe, F33 Convertible and F36 Gran Coupe versions. The later generation introduced G22 Coupe, G23 Convertible and G26 Gran Coupe models, together with newer petrol, diesel and electrified powertrains.
Battery specifications became more demanding as the range developed. Earlier vehicles may use a conventional flooded battery or AGM battery depending on equipment, while later models commonly use advanced battery management and AGM technology.
The generation code can be useful when checking fitment, but the vehicle year, exact engine and fuel type remain the most reliable information to use in the finder.
Petrol and Diesel 4 Series Batteries
BMW 4 Series petrol and diesel engines can require different levels of starting power. Diesel models generally need stronger cold-cranking performance because of their higher compression, particularly during winter.
That does not mean the largest battery is automatically the correct one. The battery must fit the available tray, connect to the existing cables and use the correct technology for the vehicle's charging system.
Versions such as the 420i, 430i, 420d, 430d and M440i should therefore be matched by exact vehicle details rather than by engine size alone.
AGM Batteries and Automatic Start/Stop
Many BMW 4 Series vehicles are factory-fitted with AGM batteries. AGM stands for Absorbent Glass Mat and is designed for vehicles that repeatedly stop and restart the engine, recover energy while driving and power numerous electrical systems.
If an AGM battery is currently fitted, replace it with another AGM battery. Installing a conventional flooded battery in its place is a downgrade and can result in shortened battery life, unreliable Start/Stop operation and charging-system problems.
Some versions may use EFB technology, although AGM is particularly common across well-equipped and higher-output BMW models. Check the label on the existing battery as well as the finder results before ordering.
Battery Demands on Convertible Models
The electrically operated roof makes battery condition especially important on the BMW 4 Series Convertible. Opening or closing the roof requires multiple motors, sensors and control units to work in sequence.
If the battery voltage is low, the roof may operate slowly, stop part-way through its cycle or display a warning message. For this reason, avoid repeatedly operating the roof while the engine is switched off.
Convertible vehicles that are stored over winter can also suffer from gradual battery discharge. Where the vehicle will be parked for long periods, an appropriate smart battery maintainer may help preserve battery condition.
Where Is the Battery Located?
On many BMW 4 Series models, the starter battery is installed in the luggage compartment rather than beneath the bonnet. Depending on the body style and generation, it may be positioned beneath the boot floor or behind a side trim panel.
The engine compartment may contain dedicated positive and negative connection points for jump-starting or battery support. These connection points do not necessarily indicate the physical location of the battery.
Consult the owner's handbook before disconnecting the battery, as removing power can affect stored settings and electronic systems.
Battery Registration After Replacement
Most modern BMW 4 Series vehicles use an Intelligent Battery Sensor and electronic energy-management system. Once the new battery has been fitted, it will normally need to be registered to the vehicle.
Registration tells the charging system that the old battery has been replaced. The vehicle can then adjust its charging behaviour for a fresh battery instead of continuing to use calculations based on the age and condition of the previous one.
If the new battery has a different capacity or uses different technology, coding may also be required. Registration and coding are related procedures, but they are not always the same thing.
Signs of a Weak BMW 4 Series Battery
A failing battery may first show itself through electrical symptoms rather than a complete no-start situation. The engine may crank more slowly, Start/Stop may become unavailable or warning messages may appear after the vehicle has been parked.
Convertible owners may notice hesitant roof operation, while Gran Coupe owners may experience intermittent tailgate or convenience-feature issues.
Other possible symptoms include dim lighting during starting, loss of stored settings and repeated low-battery warnings. A proper battery and charging-system test can help confirm whether replacement is required.
Check the Battery Before Ordering
BMW may have used more than one battery specification within the same model year. Before placing your order, compare the recommended replacement with the battery currently fitted.
- Check the overall length, width and height in millimetres.
- Confirm the position of the positive and negative terminals.
- Match the lower hold-down arrangement.
- Check whether the existing battery is standard, EFB or AGM.
- Ensure the battery cables and ventilation connection will reach correctly.
The Ah and CCA figures may vary slightly between suitable battery brands. The key requirements are the correct technology, sufficient performance and an exact physical fit.
Explore Other BMW Battery Pages
For a different model, visit our BMW car batteries page. You can also view our dedicated guides for the BMW 3 Series battery and BMW 5 Series battery.
Order Your BMW 4 Series Battery
Select your BMW 4 Series year, engine and fuel type in the finder above to see compatible Lucas batteries. The results include the battery dimensions, capacity, cold-cranking performance and other important specifications.
If you are uncertain which option is correct, use the registration helper above and send us your vehicle registration. Our battery specialists can check the application before you place your order.