The 2016 BMW 435i uses a 12-volt AGM lead-acid battery, not a high-voltage traction battery.
In the 2016 4-series coupe and gran coupe, the 12V battery powers auxiliary systems, start-stop functionality, and electronics. The high-voltage traction battery is not part of this gasoline-powered model. The 12V battery is typically located in the trunk on the passenger side, and BMW tends to equip these cars with an AGM design to tolerate frequent charging cycles. Exact specifications can vary by market and production date, so check the battery label or your VIN-specific parts diagram for the precise size and CCA rating.
Battery type and key specs
What you need to know about the battery type, capacity, and location:
- 12-volt lead-acid battery, with AGM design preferred for vehicles equipped with start-stop.
- Typical capacity around 90 Ah and cold-cranking amps around 800–900 A, depending on market and equipment.
- Location is usually in the trunk (passenger side) in a dedicated battery compartment.
- Start-stop systems and advanced electronics benefit from AGM due to higher cycling tolerance.
Knowing these details helps you source the correct replacement and avoid charging or electronic faults.
Replacement and maintenance considerations
Before replacing, ensure you understand the service requirements and what to expect:
- Use a 12V AGM battery that matches the original specifications to support stop-start and electrical loads.
- Be prepared to perform battery registration/coding with a BMW-compatible diagnostic tool so the vehicle adapts to the new battery.
- Check for corrosion on terminals; ensure proper venting and reseal the battery cover after replacement.
- Dispose of the old battery at a proper recycling facility and obtain a receipt for warranty purposes.
Correctly replacing and registering the battery helps maintain optimal charging, reduces warning lights, and preserves start-stop efficiency.
Additional context
Why AGM and the start-stop system matter
AGM batteries handle frequent cycling better than standard flooded lead-acid and are required for vehicles with start-stop systems. Using a non-AGM battery may trigger warnings or reduce performance.
Where to buy and what to ask
When shopping for a replacement, ask for an AGM 12V battery compatible with the 2016 435i and confirm whether dealer or shop battery registration is available. Have your VIN handy to ensure correct fitment and specs.
Summary: The 2016 BMW 435i uses a 12V AGM lead-acid battery located in the trunk. Replacement should match the original AGM spec and include battery registration with the vehicle's control systems to maintain start-stop and charging performance. For VIN-specific details, consult the owner's manual or a BMW technician.