The BMW 335i uses a 12-volt auxiliary battery. The exact physical group size varies by generation and market, and newer Start-Stop-equipped versions typically use an AGM battery. Replacement batteries typically range from about 60 to 90 amp-hours (Ah), with cold-cranking amps (CCA) in the hundreds depending on the type. Always verify the exact size from the battery label or the owner's manual for your car's year and specification.
Battery types and capacity by generation
Across the 335i lineup, the electrical system has shifted from conventional flooded 12V batteries to AGM units on models with Start-Stop and higher electrical demand. Capacity generally sits in the 60–90 Ah range, and AGM units provide more robust cycling performance. The exact group size—the physical fit in the engine bay or trunk—depends on year and market, so confirm with the battery label.
Common battery sizes you might encounter on a BMW 335i, depending on generation:
- Early 335i variants (roughly 2006–2010): typically a 12V flooded lead-acid battery; capacity commonly around 60–80 Ah; CCA in the lower to mid-hundreds for non-Start-Stop setups.
- Mid-generation / Start-Stop variants (roughly 2011–2015): often use an AGM 12V battery with higher cycling ability; capacity around 70–90 Ah; higher CCA values.
- Later or market-specific iterations (2016+ where applicable): continued AGM configurations with about 80–90 Ah capacity and higher CCA, depending on equipment and market.
The exact size for your car can differ; always check the battery label or manufacturer documentation to confirm the correct Group Size and capacity.
How to verify the exact battery size for your 335i
- Open the hood and locate the battery (in some models, the 12V battery is in the trunk or under a rear seat).
- Read the battery label for the Group Size or model number (common BMW group sizes include designations like H6/48, H7/49, or 94R).
- Consult the owner's manual or BMW’s official specifications for your exact year and trim to confirm whether a flooded or AGM battery is required.
- If the label is unreadable, pull the VIN and contact a BMW dealer or parts retailer to confirm the correct 12V battery size for your vehicle.
- When purchasing a replacement, specify whether your car has Start-Stop equipment to determine if an AGM battery is required.
Verifying the exact size ensures proper fit, electrical compatibility, and longevity of the battery and charging system.
Summary
In short, the BMW 335i uses a 12-volt battery, with the precise group size and chemistry varying by model year and options. Older models commonly used flooded lead-acid batteries, while newer, Start-Stop-equipped versions often use AGM batteries with higher capacity. Always check the battery label or official documentation to determine the correct Group Size and specifications for your specific car.