Electric car range and battery life have improved at a pace that makes the EVs of five years ago look modest by comparison. In 2026, twelve electric cars on sale in the UK offer a WLTP range exceeding 400 miles, and the Mercedes EQS now achieves 511 miles on a single charge under official testing. This article explains what those figures actually mean in the real world, how battery size relates to range, and what to look for when choosing an electric car lease based on how you drive.
Key Takeaways
- Real-world range is roughly 83% of the official WLTP figure, so plan for the real number.
- The longest-range EVs on sale top 500 miles WLTP (Mercedes EQS, Volvo EX60, BMW iX3).
- Bigger battery means more range: a city EV does around 160 miles, a premium model around 480.
- Most drivers cover far fewer daily miles than they expect, so a mid-size battery is plenty for most
What WLTP range figures actually mean for your driving
WLTP stands for Worldwide Harmonised Light Vehicle Test Procedure. It is the official method used to measure electric car range in the UK and Europe, and it replaced the older, more optimistic NEDC test. WLTP figures are more realistic than their predecessor, but they are still recorded under controlled conditions.
In real-world driving, you should expect to achieve roughly 80 to 85% of the WLTP figure. Cold weather, motorway speeds, heavy use of heating or air conditioning, and a loaded boot all reduce the number. The Mercedes EQS, for example, has a WLTP figure of 511 miles. In real conditions, most drivers will see around 425 miles. That is still a substantial distance, but the gap between the headline number and what you actually get is worth understanding before you sign a lease.
The practical takeaway: when you are comparing models, apply an 80 to 85% adjustment to the WLTP figure to get a more honest picture of what each car will deliver on a typical day.
How battery size determines range
Range is a direct product of battery capacity. Battery sizes are measured in kilowatt-hours (kWh). The higher the kWh figure, the more energy the battery stores, and the further the car can travel between charges.
Long-range models such as the Mercedes EQS and the new BMW iX3 carry batteries in the 85kWh to 97kWh bracket. That is why they can cover 500 miles on paper. Affordable everyday EVs tend to use smaller batteries, which is why they sit in the 250 to 300 mile range bracket. Neither is inherently better. A smaller battery charges faster, costs less to produce, and suits most daily driving patterns perfectly well.
There is a physical ceiling to how far this can go. Industry efficiency for electric drivetrains currently tops out at around 4 to 5 miles per kWh. To achieve a genuine 1,000-mile range, a car would need a battery of 200 to 250kWh. That is not practical in a road car at present, so the focus for manufacturers is on improving efficiency rather than simply adding more battery cells.
The models pushing range forward in 2026
The long-range end of the UK market has moved quickly. Here is where things stand with the models setting the benchmarks:
Mercedes EQS. The longest-range electric car available in the UK, with 511 miles WLTP and approximately 425 miles in real-world conditions. A facelifted variant, the EQS 450+ Premium, can reach 542 miles in its most efficient configuration. Battery size sits in the upper end of the 85kWh to 97kWh range.
Volvo EX60. The range-topping P12 AWD is WLTP-certified at 503 miles, making it one of the longest-range electric cars on sale in the UK. The rear-wheel-drive P6 starts at 385 miles and the P10 AWD at 410 miles.
BMW iX3. The new generation achieves 500 miles WLTP. This is a significant jump: the previous iX3 managed only 280 miles WLTP, which translated to around 220 miles in real-world use. The near-doubling of range between generations is a useful illustration of how quickly battery technology is advancing.
Mercedes CLA Electric. Sits at 492 miles WLTP, making it the third-longest-range model in the current UK market.
For drivers who do not need these headline figures, there are now at least 12 models exceeding 400 miles WLTP, and the typical affordable electric car sits comfortably in the 250 to 300 mile bracket. For most people commuting 30 to 50 miles a day and charging overnight at home, that is more than sufficient.
How battery life holds up over time
Range is one question. Battery longevity is another. Electric car batteries degrade gradually over time, meaning the maximum range the battery can deliver reduces slightly with each passing year. This is a normal characteristic of lithium-ion battery technology, the same type used in smartphones and laptops.
Modern electric car batteries are engineered to degrade slowly. Manufacturers typically warrant them for eight years or a set mileage, whichever comes first, guaranteeing they will retain a minimum percentage of their original capacity. The precise figures vary by manufacturer, so it is worth checking the warranty terms for any model you are considering.
If you are leasing rather than buying, battery degradation is largely not your concern. A standard lease contract runs for two to four years, well within the period where degradation is minimal. At the end of the contract, you return the car and move on to a newer model. This is one of the practical advantages of leasing an electric car rather than purchasing one outright: you are not exposed to the long-term depreciation that battery ageing can cause.
A few habits do help preserve battery health over the life of a lease. Avoid regularly charging to 100% unless you need the full range for a specific journey. Most manufacturers recommend a daily charge limit of 80% for routine use. Similarly, frequent use of rapid chargers is convenient but puts more stress on the battery than slower home charging. Using a home wallbox as your primary charging method, with rapid chargers as an occasional supplement, is the sensible approach.
Charging infrastructure and what it means for range planning
The UK now has over 75,000 public charge points, and there are approximately 2.3 million battery electric vehicles on UK roads. The network has grown considerably, and for most drivers, the combination of home charging and public infrastructure makes range planning straightforward.
For day-to-day use, home charging covers the majority of needs. A 7kW home wallbox will replenish most mid-range batteries overnight. For longer journeys, rapid chargers at motorway services can add significant range in 20 to 45 minutes. Many electric cars also include navigation systems that factor in remaining charge and route you to chargers automatically.
The practical implication for choosing a lease: if you have access to home charging, a 250 to 300 mile WLTP range is adequate for most drivers. If you regularly cover 150 miles or more in a single trip without a guaranteed charge at the other end, a 400-mile-plus model gives you more flexibility and removes the need to plan charging stops on every journey.
Choosing the right range for your lease
The right range depends on how you actually drive, not on the longest figure you can find in a brochure. A 500-mile battery is useful if you regularly travel long distances without access to charging. For most urban and suburban drivers, it is more battery than you will ever use, and it comes with a higher monthly payment.
Work out your typical daily mileage, add a margin for occasional longer trips, and apply the 80 to 85% real-world adjustment to any WLTP figure you are comparing. That calculation will tell you more than any headline range claim.
If you are ready to compare electric car lease deals across the full range of available models, browse the electric car leasing section on the Car Leasing Made Simple website to see current monthly payments and available specifications.
Frequently asked questions
The Mercedes EQS leads the UK market with a WLTP range of 511 miles, which equates to approximately 425 miles in real-world driving conditions. A facelifted variant of the EQS 450+ Premium can reach 542 miles in its most efficient specification.
Real-world range is typically 80 to 85% of the official WLTP figure. Factors including cold weather, motorway speeds, air conditioning use, and vehicle load all reduce the range you will achieve compared to the test result.
Electric car batteries degrade slowly over time. Most manufacturers warrant the battery for eight years or a set mileage, guaranteeing it will retain a minimum percentage of its original capacity. For drivers on a two to four year lease, degradation during the contract period is minimal.
Yes. Because a standard lease runs for two to four years, you return the car before significant battery ageing occurs. You are not exposed to the long-term range reduction that affects owners who keep a car for ten years or more.
The longest-range models currently use batteries in the 85kWh to 97kWh bracket. Industry efficiency sits at around 4 to 5 miles per kWh, so achieving 400 miles requires a battery of roughly 80 to 100kWh depending on the car’s weight and aerodynamics.
There are over 75,000 public charge points across the UK as of early 2026, alongside a growing network of rapid chargers at motorway services, retail parks, and dedicated charging hubs.
