The 2004 BMW 330xi typically uses a 12-volt lead-acid battery in Group Size 94R, with about 90 Ah capacity and roughly 800–850 cold-cranking amps (CCA).
Battery basics for the 2004 330xi
The 330xi from the E46 generation commonly places the battery in the trunk (right rear) to accommodate the car’s electronics and cargo layout. The most commonly referenced group size for this era is 94R in BMW parts catalogs. Exact sizing can vary by market and optional equipment, so verifying the specific specification for your car is wise before replacement.
Common specifications you might encounter when shopping for a replacement include the following group size and ratings.
- Group Size 94R — 12-volt lead-acid battery, typically around 90–95 Ah with about 800–850 CCA. This size is widely used in E46 3-series models including the 330xi, often mounted in the trunk.
That size is the standard for many 2004 330xi models, but variations exist based on market and equipment.
How to confirm the exact battery size for your car
To ensure you purchase the correct replacement, verify the exact size and ratings from the original equipment or a reliable source before buying. Do not rely on guesswork, as wrong size can cause fitment issues or electronics problems.
- Check the battery label: Look for the group size (e.g., 94R) and the cold-cranking amps (CCA) and ampere-hour (Ah) rating printed on the battery.
- Consult the owner's manual or BMW official service information for the recommended group size if the label is unreadable.
- Inspect the current battery mounting: ensure the dimensions fit in the trunk battery tray and that the terminal positions align with cable routing.
- When in doubt, contact a BMW dealer or qualified automotive parts retailer with your VIN to confirm the exact required battery size.
Following these steps will help you choose the correct replacement and maintain the vehicle's electrical system integrity.
Summary
For the 2004 BMW 330xi, the typical battery size is a 12-volt Group Size 94R with about 90 Ah capacity and 800–850 CCA, commonly located in the trunk. Always verify the exact size using the battery label, the owner's manual, or a dealer to account for regional variations or optional equipment. This ensures proper fit and reliable performance.