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BYD Sealion 7 vs Polestar 4 Coupé
Selected trimComfortChange trim300 mi · 82.5 kWh · £44,990
Selected trimRear motorChange trim385 mi · 100 kWh · £56,750
At a glance
In this comparison, BYD Sealion 7 leads on family practicality, while the Polestar 4 Coupé leads on motorway range, charging speed and running costs.
Which should you choose?
Choose the BYD Sealion 7 if...
- you need the most family-friendly option with good safety and space
Choose the Polestar 4 Coupé if...
- you do long motorway journeys - it has the best estimated real-world range at speed
- you need the fastest charging of these options
- you want the lowest running costs - from just 2.2p per mile on off-peak electricity
How we reached the recommendation
Verdict
Our take
The Polestar 4 Coupé leads in the most categories, but each car here has its strengths.
Value
BYD
6
Polestar
6.2
Too close to call
Motorway RangePolestar
BYD
3.1
Polestar
6.3
FamilyBYD
BYD
8
Polestar
6.4
ChargingPolestar
BYD
5.9
Polestar
8.2
Cost Per MilePolestar
BYD
0.8
Polestar
3.8
What each car does better
See the specification differences behind the verdict, with supporting figures for each advantage.
Key specifications
Compare the key specifications for your selected trims.
| Measure | BYD Sealion 7Comfort | Polestar 4 CoupéRear motor |
|---|---|---|
| Price | £44,990 (better) | £56,750 |
| Official range | 300 miles | 385 miles (better) |
| Boot space | 520 L | 526 L (better) |
| 10-80% rapid charge | 24 min | Not available |
| 0-62 mph | 6.7 sec | Not available |
Size Comparison
View:
Align by:
BYD Sealion 7
Polestar 4 Coupé
Length
BYD Sealion 74,830mm-10mm
Polestar 4 Coupé4,840mm
Width
BYD Sealion 71,925mm-83mm
Polestar 4 Coupé2,008mm
Height
BYD Sealion 71,620mm
Polestar 4 Coupé1,534mm-86mm
Space, size & parking
Parking & manoeuvring
Compare exterior dimensions to assess how each car fits UK parking spaces.
| Measure | BYD Sealion 7Comfort | Polestar 4 CoupéRear motor |
|---|---|---|
| Length | 4,830 mm | 4,840 mm |
| Width (mirrors folded) | 1,925 mm (better) | 2,008 mm |
| Width with mirrors out | 2,189 mm | 2,139 mm (better) |
| Height | 1,620 mm | 1,534 mm |
| Turning circle | 11.7 m | 11.6 m (better) |
| Clearance in a standard bayA standard UK parking bay is 2,400 mm wide. | 475 mm spare (better) | 392 mm spare |
People & luggage
Compare seating, child-seat mounting points, boot space and towing capacity.
| Measure | BYD Sealion 7Comfort | Polestar 4 CoupéRear motor |
|---|---|---|
| Seats | 5 | 5 |
| Boot space (seats up) | 520 L | 526 L (better) |
| Boot space (seats down) | 1789 L | Not available |
| Frunk | 58 L | Not available |
| Towing capacity (braked) | 750 kg | Not available |
How each stacks up
Percentile ranks against UK EVs of the same body style.
BYD Sealion 7
- One of 33 of 232 UK EVs in our catalogue with V2L (vehicle-to-load) support.
- At 4,830 mm, longer than 80% of SUVs we track.
Polestar 4 Coupé
Not enough peers to make confident percentile claims.
Full specifications
| Specification |  BYD Sealion 7 Comfort |  Polestar 4 Coupé Rear motor |
|---|---|---|
| Dimensions | ||
| Length | 4.83m | 4.84m+10mm |
| Width | 1.93m | 2.01m+83mm |
| Width (mirrors) | 2.19m | 2.14m-50mm |
| Height | 1.62m | 1.53m-86mm |
| Wheelbase | 2.93m | 3.00m+69mm |
| Ground Clearance | 157mm | 166mm+9mm |
| Capacity | ||
| Boot (seats up) | 520L | 526L (better) |
| Boot (seats down) | 1789L | Not available |
| Frunk | 58L | Not available |
| Seats | 5 | 5 |
| Practicality | ||
| Turning Circle | 11.7m | 11.64m (better) |
| Kerb Weight | 2,225kg (better) | 2,230kg |
| Towing Capacity | 750kg | Not available |
| Electric | ||
| Battery | 82.5kWh | 100kWh (better) |
| Range (WLTP) | 300 mi | 385 mi (better) |
| Max DC Charge | 150kW | 200kW (better) |
| Pricing | ||
| UK MSRP | £44,990 (better) | £56,750 |
| Details | ||
| Body Style | SUV | Coupe SUV |
| Available | 2025+ | 2026+ |
Range & charging
Range, charging & battery
Check official and estimated driving range alongside charging speeds, efficiency and battery technology.
| Measure | BYD Sealion 7Comfort | Polestar 4 CoupéRear motor |
|---|---|---|
| Official range (WLTP) | 300 miles | 385 miles (better) |
| Estimated motorway rangeEVcarsguide estimate at sustained motorway speed. | 204 miles | 321 miles (better) |
| 10-80% rapid charge time | 24 min | Not available |
| Max rapid charge rate | 150 kW | 200 kW (better) |
| Home AC charging | 11 kW | 11 kW |
| Energy consumption | 199 Wh/km | Not available |
| Usable battery capacity | 82.5 kWh | 100 kWh (better) |
| Battery chemistry | LFP | Not available |
| Heat pump | Standard | Not available |
Driving & everyday use
Performance & drivetrain
Compare acceleration, power and drivetrain specifications for the selected trims.
| Measure | BYD Sealion 7Comfort | Polestar 4 CoupéRear motor |
|---|---|---|
| 0-62 mph | 6.7 sec | Not available |
| Power | 230 kW (better) | 200 kW |
| Torque | 380 Nm | Not available |
| Drivetrain | RWD | RWD |
What the critics say
See how UK motoring publications rate each car in their road tests. One car has more review coverage than the other - we show that rather than guessing.
BYD Sealion 7
Comfort
6.6/10
average across 6 reviews
- Parkers3.9/5
- Auto Express3.5/5
- Electrifying.com7/10
Polestar 4 Coupé
Rear motor
No critic reviews gathered yet for this car.
Watch the reviews
Watch selected video reviews here, or visit each model page for the full collection.
Reviews and videos discuss each model overall; the specifications above apply to your selected trims.
Prices & deals
Calculate your real costs
For a useful running-cost comparison, factor in your mileage, charging access and current petrol or diesel car alongside the EV estimate.
Compare with petrol or diesel
Compare purchase price, energy, road tax and maintenance with a petrol or diesel alternative.
Calculate company-car tax
Work out monthly Benefit-in-Kind using current and future HMRC rates.
Cost per mile
Compare EV charging costs per mile with petrol and diesel using your charging options.
Check a lease quote
Assess the effective monthly cost alongside the list price and expected depreciation.
Safety & ownership confidence
Euro NCAP - BYD Sealion 7 Comfort
Tested 2025
Adult Occupant87%
Child Occupant93%
Vulnerable Road Users76%
Safety Assist79%
Full result on euroncap.com (opens in new tab)
Euro NCAP - Polestar 4 Coupé Rear motor
Tested 2025
Adult Occupant92%
Child Occupant85%
Vulnerable Road Users81%
Safety Assist79%
Full result on euroncap.com (opens in new tab)
Warranty
Check the published battery warranty cover for each selected trim.
| Measure | BYD Sealion 7Comfort | Polestar 4 CoupéRear motor |
|---|---|---|
| Battery warranty | 8 years | 8 years |
| Battery warranty distance | 250,000 km (better) | 160,934 km |
Buying options
Get a quote
BYD Sealion 7
Used on AutoTraderLease deals
Polestar 4 Coupé
Used on AutoTraderLease deals
Frequently asked questions
Is the Polestar 4 Coupé worth the extra £11,760 over the BYD Sealion 7?
The Polestar 4 Coupé costs £11,760 more than the BYD Sealion 7. For that premium it adds 85 miles more WLTP range and 50 kW faster peak rapid charging. The BYD Sealion 7 is not just cheaper - it also offers 30 kW more power. On EVcarsguide's combined category scores, the Polestar 4 Coupé comes out ahead overall.
Which is cheaper to own over 5 years, the BYD Sealion 7 or the Polestar 4 Coupé?
The BYD Sealion 7 is £11,760 cheaper to buy. The Polestar 4 Coupé is cheaper to charge, roughly £176 a year versus £216 for the BYD Sealion 7, at 8,000 miles on an off-peak home tariff. Add 5 years of charging and the BYD Sealion 7 comes out roughly £11,560 cheaper overall. These figures cover list price and home charging only - insurance, servicing, tyres and depreciation will move the real total.
What are the BYD Sealion 7 and Polestar 4 Coupé like on a long motorway trip?
EVcarsguide estimates a real-world motorway range of about 204 miles for the BYD Sealion 7 and 321 miles for the Polestar 4 Coupé - both below their WLTP figures, because sustained high speed is the hardest case for an EV. The Polestar 4 Coupé goes roughly 117 miles further between charging stops.
Which is easier to park and drive in town, the BYD Sealion 7 or the Polestar 4 Coupé?
The BYD Sealion 7 is the easier car for tight UK car parks: it is 83 mm narrower than the Polestar 4 Coupé. In a standard 2,400 mm bay that leaves about 475 mm of total clearance for the BYD Sealion 7 and about 392 mm of total clearance for the Polestar 4 Coupé.
Go deeper on each car
Visit the full model pages for owner feedback, expert reviews, used prices and battery-health information.
Compare against other rivals
Compare similarly sized and priced electric cars before finalising your shortlist.
More BYD Sealion 7 comparisons
More Polestar 4 Coupé comparisons
See both cars in our rankings
EVcarsguide scores every verified EV on price, range, family use and running costs. Here is where this pair appears.
Where the BYD Sealion 7 and Polestar 4 Coupé rank among the best family EVsWhere the BYD Sealion 7 and Polestar 4 Coupé rank among long-range EVsWhere the BYD Sealion 7 and Polestar 4 Coupé rank among the best motorway EVsWhere the BYD Sealion 7 and Polestar 4 Coupé rank among the best city EVsWhere the BYD Sealion 7 and Polestar 4 Coupé rank among the cheapest EVs to runWhere the BYD Sealion 7 and Polestar 4 Coupé rank among EVs with the biggest boots
If neither is quite right
Explore other verified electric cars that may better suit the priorities this pair does not meet.
Further reading
Explore buying and ownership guides to help you choose between these electric cars.
Data accuracy
Specs are sourced from manufacturer websites and manually reviewed. These figures were last verified .