Choosing the right battery for your BMW Z4 E89 (produced between 2009 and 2016) is a crucial decision that directly affects your car’s reliability and performance. The Z4 E89 comes with several different petrol engine variants, and each of them has specific requirements regarding the type, capacity, and current rating of the battery. The primary factor that will determine your choice is whether your particular model is equipped with the Start-Stop system, as this has a significant impact on the kind of battery technology required.
In the range of Z4 E89 engines, those like the sDrive 18i and sDrive 20i are equipped with the Start-Stop system, while others, such as the sDrive 23i, 30i, 35i, and 35is, do not have Start-Stop technology. This distinction is important because vehicles with Start-Stop systems place much greater demands on the battery. The battery must be able to handle frequent engine starts and stops, recharge quickly, and provide a stable power supply to all electrical systems, even when the engine is off during stops at traffic lights or in heavy traffic. For this reason, all Z4 E89 models, regardless of the specific engine, utilize AGM (Absorbent Glass Mat) batteries, which are far superior to conventional lead-acid batteries in terms of resistance to deep discharges, vibration, and high cycling capability.
For those owning a Z4 E89 with the sDrive 18i or sDrive 23i, 30i, 35i, or 35is engines, you’ll generally be looking for an AGM battery with a capacity between 70 and 72 Ah and a cold cranking amperage (CCA) between 720 and 760 A. These specifications ensure that the battery has enough reserve power and starting capability to reliably turn over the engine, even in cold weather or after short drives. Some example compatible models for these requirements include the Bosch S5A 08, Exide EK700 and EK720, Halfords AGM 096, Lucas LF096, and Varta E39. These are not the only possibilities, but they are widely available and known for their reliability and performance.
If your Z4 E89 features the sDrive 20i or sDrive 28i engines with the Start-Stop system, your battery requirements step up slightly, as these engines demand higher capacity and current. Here, you’ll need an AGM battery with a capacity of 80 to 82 Ah and a CCA of around 800 A. The increased capacity and amperage ensure the battery can handle the frequent restart cycles imposed by the Start-Stop system, as well as supply stable power to all the vehicle’s increasingly sophisticated electronics. Example matching models for these specifications include Bosch S5A 11, Exide EK800 and EK820, Halfords AGM 115, Lucas LF115, and Varta F21. Again, these are representative examples; always confirm fitment and compatibility with your supplier.
It’s worth noting that AGM batteries have a different internal construction compared to regular flooded batteries. Instead of a liquid electrolyte sloshing freely between the plates, AGM batteries use a fiberglass mat to hold the electrolyte in place. This makes them spill-proof, highly resistant to vibration, and capable of being mounted in various positions—important attributes for sports cars like the Z4, which are often driven enthusiastically. Another advantage is their ability to handle deep discharge cycles, which is essential for Start-Stop operation and for vehicles that may be stored for part of the year, as is common with convertibles like the Z4.
When replacing the battery in a BMW Z4 E89, it’s not only about physical size and capacity. Modern BMWs, including the E89, require that the new battery be registered with the vehicle’s computer system (using a diagnostic tool) after installation. This ensures that the charging system is correctly calibrated to the new battery’s characteristics. Failing to register the new battery can lead to poor charging performance and reduced battery lifespan.
In conclusion, choosing the correct AGM battery—matched in capacity and cold cranking amperage to your engine and Start-Stop configuration—is essential for ensuring the longevity and reliability of your BMW Z4 E89. While there are many suitable models on the market, always check compatibility and register the new battery upon installation. Interestingly, the push toward AGM batteries in cars like the Z4 E89 reflects the broader automotive industry’s shift to more advanced battery technologies, a trend that’s only accelerating as cars become increasingly electrified and feature-rich.
BMW Z4 in version E89 was produced in the years 2009 – 2016. Below we present the specifications of batteries suitable for specific engines.
Basic parameters of batteries suitable for BMW Z4 (2009-2016):
| Layout | Terminal types | Base hold-down |
|---|---|---|
| 0 – positive on the right side | 1 | B13 |
BMW Z4 E89 – petrol engines:
- sDrive 18 i – with Start-Stop
- sDrive 23 i
- sDrive 30 i
- sDrive 35 i
- sDrive 35 is
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S5 AGM S5A 08 | 70 Ah 760 A | 278x175x190 mm | More |
| Exide AGM EK700 | 70 Ah 760 A | 278x175x190 mm | More |
| Exide AGM EK720 | 72 Ah 760 A | 278x175x190 mm | More |
| Halfords Standard AGM 096 | 70 Ah 720 A | 278x175x190 mm | More |
| Halfords Advanced AGM 096 | 70 Ah 760 A | 278x175x190 mm | More |
| Lucas Fusion AGM LF096 | 70 Ah 760 A | 278x175x190 mm | More |
| Varta Silver Dynamic AGM E39 | 70 Ah 760 A | 278x175x190 mm | More |
BMW Z4 E89 – petrol engines:
- sDrive 20 i – with Start-Stop
- sDrive 28 i – with Start-Stop
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S5 AGM S5A 11 | 80 Ah 800 A | 315x175x190 mm | More |
| Exide AGM EK800 | 80 Ah 800 A | 315x175x190 mm | More |
| Exide AGM EK820 | 82 Ah 800 A | 315x175x190 mm | More |
| Halfords Advanced AGM 115 | 80 Ah 800 A | 317x175x190 mm | More |
| Lucas Fusion AGM LF115 | 80 Ah 800 A | 315x175x190 mm | More |
| Varta Silver Dynamic AGM F21 | 80 Ah 800 A | 315x175x190 mm | More |
If you’re still unsure which battery fits your BMW Z4 , or if you want to help others in their selection, please send us a photo of your current battery in the comment section at the bottom of the page. You can also send the picture to contact@whatbattery.co.uk (we will place it in the comments to also help other users). Be sure to specify the car model, year, type, as well as the engine capacity and power. We’ll do our best to assist you!