Choosing the right battery for a classic Jaguar XJ XJ40 produced between 1986 and 1994 is a crucial decision for every owner who values both performance and reliability. This model, a true icon of British automotive engineering, was available with several powerful petrol engines, including the R6 4.0, the R6 3.2 24V, and the formidable V12 6.0. All these engines share a common need: a dependable 12V lead-acid battery, as these vehicles were manufactured before the widespread implementation of Start-Stop systems. This means the battery focus is fully on starting power and durability rather than frequent engine cycling.
When determining the correct battery for your Jaguar XJ40, two primary specifications must be considered: capacity (measured in ampere-hours, Ah) and cold cranking amperage (CCA, measured in amperes). For all three engine variants, the ideal battery falls within a capacity range of 60 to 65 Ah. This provides enough reserve power for the vehicle’s electrical systems, ensuring smooth operation of not only the engine but also the various comfort and safety features typical of luxury sedans from this era. Equally important is the cold cranking amperage, which should be between 540 and 640 A. This ensures reliable starts even under challenging conditions, such as cold mornings or after extended periods of inactivity.
The appropriate technology for these Jaguars is the conventional lead-acid (lead-acid) battery. While newer battery types such as AGM or EFB are becoming popular in modern vehicles, especially those equipped with advanced electronics and Start-Stop technology, the classic XJ40 does not require these modern solutions. In fact, using a standard lead-acid battery is not only more cost-effective, but also fully compatible with the vehicle’s original electrical system, avoiding potential issues with charging or fitment.
Some of the sample batteries that fit these requirements include the Bosch S40 05 and S50 05, the Exide EA640 and EB620, the Halfords HCB 027, Lucas LP027 and LS027, as well as the Varta D15 and D24. These are just examples of compatible models; other brands offering batteries within the specified range of capacity and CCA will also serve well. When selecting among these, it is wise to consider the reputation of the manufacturer, the length of the warranty, and the availability of after-sales support, especially for a cherished classic like the XJ40.
One interesting aspect about the XJ40 is that, despite its luxury pedigree and powerful engine options—including the rare V12—it was engineered with a relatively modest electrical draw compared to modern vehicles. This allows classic car enthusiasts to enjoy the benefits of a straightforward, robust battery setup without the need for specialized, high-tech solutions. Nevertheless, it is always a good idea to check the dimensions of the battery and make sure it fits securely in the battery tray, as some variations may exist between markets or due to previous modifications made by earlier owners.
To keep your Jaguar XJ40 running flawlessly, regular maintenance of the battery is recommended. This includes checking the terminals for corrosion, ensuring the battery is securely mounted, and periodically verifying the charge level, especially if the car is used infrequently. If the vehicle is stored for long periods, consider using a smart charger or battery maintainer to prevent deep discharge, which can significantly shorten battery life.
In conclusion, selecting the right battery for your Jaguar XJ XJ40 from 1986-1994 involves choosing a high-quality, lead-acid battery with a capacity of 60-65 Ah and a cold cranking amperage of 540-640 A. The aforementioned Bosch, Exide, Halfords, Lucas, and Varta models are just some of the suitable options available in the market. By fitting a battery that matches these specifications, you ensure that your classic Jaguar continues to deliver the sophisticated driving experience it was designed for, whether you’re enjoying it on the open road or preserving it as a collector’s gem.
Jaguar XJ in version XJ40 was produced in the years 1986 – 1994. The following table presents information about batteries that match each of the engines available on the market.
Basic parameters of batteries suitable for Jaguar XJ (1986-1994):
| Layout | Terminal types | Base hold-down |
|---|---|---|
| 0 – positive on the right side | 1 | B13 |
Jaguar XJ XJ40 – petrol engines:
- R6 3.2 24V
- R6 4.0
- V12 6.0
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S4 S40 05 | 60 Ah 540 A | 242x175x190 mm | More |
| Bosch S5 S50 05 | 63 Ah 610 A | 242x175x190 mm | More |
| Exide Excell EB620 | 62 Ah 540 A | 242x175x190 mm | More |
| Exide Premium EA640 | 64 Ah 640 A | 242x175x190 mm | More |
| Halfords Standard HCB 027 | 62 Ah 550 A | 242x175x190 mm | More |
| Lucas Premium LP027 | 60 Ah 540 A | 243x175x190 mm | More |
| Lucas Supreme LS027 | 65 Ah 640 A | 242x175x190 mm | More |
| Varta Blue Dynamic D24 | 60 Ah 540 A | 242x175x190 mm | More |
| Varta Silver Dynamic D15 | 63 Ah 610 A | 242x175x190 mm | More |
FAQ – Jaguar XJ battery
What is the correct battery size for a Jaguar XJ (XJ40) 1986-1994?
The recommended battery size for the Jaguar XJ (XJ40) 1986-1994 is typically the 096 battery type, which ensures proper fitment and reliable starting power for your vehicle.
What are the recommended cold cranking amps (CCA) for the Jaguar XJ40 battery?
The ideal battery for the Jaguar XJ40 should have a minimum of 680 CCA (Cold Cranking Amps) to provide reliable starting performance, especially in colder climates.
How do I know if my Jaguar XJ40 battery needs replacement?
Common signs that your Jaguar XJ40 battery needs replacement include slow engine cranking, dim lights, warning indicators on the dashboard, or if the battery is over 5 years old.
Does the Jaguar XJ (XJ40) 1986-1994 require an AGM or a standard lead-acid battery?
The Jaguar XJ (XJ40) 1986-1994 can use either a standard lead-acid battery or an AGM battery, but AGM batteries may offer improved performance and a longer lifespan for vehicles with higher electrical demands.
Where is the battery located in the Jaguar XJ40?
The battery in the Jaguar XJ40 is located in the engine bay, typically on the right-hand side (passenger side for UK models), making it easily accessible for maintenance or replacement.
How often should I replace the battery in my Jaguar XJ (XJ40)?
It is recommended to replace the battery in your Jaguar XJ (XJ40) every 4 to 5 years, or sooner if you experience starting issues or if the battery fails a diagnostic test.
If you’re still unsure which battery fits your Jaguar XJ , 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!
See also information about other cars of this manufacturer
| Jaguar XF X250 (2007-2015) battery |
| Jaguar XJ X300 (1994-1997) battery |
| Jaguar XJ X308 (1997-2003) battery |
| Jaguar XJ X350, X358 (2003-2009) battery |
| Jaguar XJ X351 (2009-2019) battery |