The 2008 BMW 135i typically uses a 12-volt lead-acid battery with about 90 amp-hours of capacity, commonly in a Group 49/H6 size, and roughly 680–760 cold-cranking amps. Some markets or options may use an AGM variant instead of a standard flooded battery.
In detail, the 135i (part of BMW’s E82 line) relies on a standard 12V battery to power the car’s starting and electrical systems. Exact sizing can vary by market, trim, and any optional equipment, so the most reliable way to confirm is to check the battery label, the vehicle’s owner manual, or the service data for your VIN. Replacements should match or exceed the original specifications to ensure proper operation of the vehicle’s electrical load and electronics.
Battery specifications and group size
Below are the typical specifications you can expect for a 2008 BMW 135i battery. Note that variations do exist by market and production date.
- Battery type: 12V lead-acid (flooded) in most cases; some cars may use an AGM variant depending on market or equipment
- Capacity (Ah): about 90 Ah
- Group size: commonly Group 49 / H6 (the physical size used by many BMW models of that era)
- Cold-cranking amps (CCA): roughly 680–760 A
- Location: battery is typically mounted in the trunk on many BMWs of this era, but always verify the exact mounting for your vehicle
Concluding, the standard configuration for the 2008 BMW 135i is a 12V battery with around 90 Ah, Group 49/H6 sizing, and about 700 CCA. Market-specific variants may differ, and an AGM-equipped car will have different internals but still require a compatible size and CCA rating.
How to verify the correct battery for your car
To ensure you purchase the right replacement, confirm the group size, capacity, and CCA, and match them to your VIN and vehicle options.
- Check the vehicle’s owner’s manual or service data for the exact battery specification and group size
- Inspect the current battery label on the top or side of the battery for group size (e.g., H6/Group 49), capacity (Ah), and CCA
- If replacing, ensure the replacement is compatible with the car’s electrical system, especially if your model has any high-demand electronics or optional start-stop features
- Consult a BMW dealer or qualified automotive technician if you’re unsure, especially to confirm whether an AGM version is required for your market
In short, verify the spec with the label or VIN-specific data to avoid mismatches. Proper sizing helps ensure reliable starts and avoids electrical issues in the long term.
Summary
The 2008 BMW 135i generally uses a 12V battery around 90 Ah, with a Group 49/H6 size and roughly 680–760 CCA. Market variations and optional AGM batteries can alter these numbers. Always verify the exact specs on the battery label or via the vehicle’s documentation to ensure a correct replacement.