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BMW iX (2021-2025) vs BYD Sealion 7
Selected trimxDrive40 · 2021-25Change trim257 mi · 76.6 kWh · £69,905
Selected trimComfortChange trim300 mi · 82.5 kWh · £44,990
At a glance
In this comparison, BMW iX stays competitive across the board, while the BYD Sealion 7 leads on value for money and charging speed.
Which should you choose?
Choose the BYD Sealion 7 if...
- you want the most for your money - best overall spec per pound
- you need the fastest charging of these options
How we reached the recommendation
Verdict
Our take
The BYD Sealion 7 leads in the most categories, but each car here has its strengths.
ValueBYD
BMW
4.1
BYD
6
Motorway Range
BMW
3
BYD
3.1
Too close to call
Family
BMW
7.8
BYD
8
Too close to call
ChargingBYD
BMW
3.7
BYD
5.9
What each car does better
See the specification differences behind the verdict, with supporting figures for each advantage.
BYD Sealion 7
Comfort
- £24,915 cheaper
- 43 miles more WLTP range
- 11 min quicker 10-80% rapid charge
- 1.1 m tighter turning circle
Key specifications
Compare the key specifications for your selected trims.
| Measure | BMW iXxDrive40 | BYD Sealion 7Comfort |
|---|---|---|
| Price | £69,905 | £44,990 (better) |
| Official range | 257 miles | 300 miles (better) |
| Boot space | 500 L | 520 L (better) |
| 10-80% rapid charge | 35 min | 24 min (better) |
| 0-62 mph | 4.6 sec (better) | 6.7 sec |
Size Comparison
View:
Align by:
BMW iX
BYD Sealion 7
Length
BMW iX4,965mm
BYD Sealion 74,830mm-135mm
Width
BMW iX1,970mm
BYD Sealion 71,925mm-45mm
Height
BMW iX1,695mm
BYD Sealion 71,620mm-75mm
Space, size & parking
Parking & manoeuvring
Compare exterior dimensions to assess how each car fits UK parking spaces.
| Measure | BMW iXxDrive40 | BYD Sealion 7Comfort |
|---|---|---|
| Length | 4,965 mm | 4,830 mm |
| Width (mirrors folded) | 1,970 mm | 1,925 mm (better) |
| Width with mirrors out | Not available | 2,189 mm |
| Height | 1,695 mm | 1,620 mm |
| Turning circle | 12.8 m | 11.7 m (better) |
| Clearance in a standard bayA standard UK parking bay is 2,400 mm wide. | 430 mm spare | 475 mm spare (better) |
People & luggage
Compare seating, child-seat mounting points, boot space and towing capacity.
| Measure | BMW iXxDrive40 | BYD Sealion 7Comfort |
|---|---|---|
| Seats | 5 | 5 |
| Boot space (seats up) | 500 L | 520 L (better) |
| Boot space (seats down) | 1750 L | 1789 L (better) |
| Frunk | Not available | 58 L |
| Towing capacity (braked) | 2,500 kg (better) | 750 kg |
How each stacks up
Percentile ranks against UK EVs of the same body style.
BMW iX
- At 4,965 mm, longer than 90% of SUVs we track.
- Braked towing capacity of 2,500 kg, a stronger tow rating than 90% of SUVs we track.
- 3,000 mm wheelbase, longer than 90% of SUVs we track.
BYD Sealion 7
- One of 33 of 233 UK EVs in our catalogue with V2L (vehicle-to-load) support.
- At 4,830 mm, longer than 80% of SUVs we track.
Full specifications
| Specification |  BMW iX xDrive40 |  BYD Sealion 7 Comfort |
|---|---|---|
| Dimensions | ||
| Length | 4.96m | 4.83m-135mm |
| Width | 1.97m | 1.93m-45mm |
| Width (mirrors) | Not available | 2.19m |
| Height | 1.70m | 1.62m-75mm |
| Wheelbase | 3.00m | 2.93m-70mm |
| Ground Clearance | Not available | 157mm |
| Capacity | ||
| Boot (seats up) | 500L | 520L (better) |
| Boot (seats down) | 1750L | 1789L (better) |
| Frunk | Not available | 58L |
| Seats | 5 | 5 |
| Practicality | ||
| Turning Circle | 12.8m | 11.7m (better) |
| Kerb Weight | Not available | 2,225kg |
| Towing Capacity | 2,500kg (better) | 750kg |
| Electric | ||
| Battery | 76.6kWh | 82.5kWh (better) |
| Range (WLTP) | 257 mi | 300 mi (better) |
| Max DC Charge | 150kW | 150kW |
| Pricing | ||
| UK MSRP | £69,905 | £44,990 (better) |
| Details | ||
| Body Style | SUV | SUV |
| Available | 2021–2025 | 2025+ |
Range & charging
Range, charging & battery
Check official and estimated driving range alongside charging speeds, efficiency and battery technology.
| Measure | BMW iXxDrive40 | BYD Sealion 7Comfort |
|---|---|---|
| Official range (WLTP) | 257 miles | 300 miles (better) |
| Estimated motorway rangeEVcarsguide estimate at sustained motorway speed. | 214 miles (better) | 204 miles |
| 10-80% rapid charge time | 35 min | 24 min (better) |
| Max rapid charge rate | 150 kW | 150 kW |
| Home AC charging | 11 kW | 11 kW |
| Energy consumption | Not available | 199 Wh/km |
| Usable battery capacity | 71 kWh | 82.5 kWh (better) |
| Battery chemistry | NMC | LFP |
| Heat pump | Not available | Standard |
Driving & everyday use
Performance & drivetrain
Compare acceleration, power and drivetrain specifications for the selected trims.
| Measure | BMW iXxDrive40 | BYD Sealion 7Comfort |
|---|---|---|
| 0-62 mph | 4.6 sec (better) | 6.7 sec |
| Power | 240 kW (better) | 230 kW |
| Torque | 765 Nm (better) | 380 Nm |
| Drivetrain | AWD | 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.
BMW iX
xDrive40
No critic reviews gathered yet for this car.
BYD Sealion 7
Comfort
6.6/10
average across 6 reviews
- Parkers3.9/5
- Auto Express3.5/5
- Electrifying.com7/10
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
New and used prices
Current pricing and recent used-market behaviour.
| Measure | BMW iXxDrive40 | BYD Sealion 7Comfort |
|---|---|---|
| Used market price from | £26,350 | £30,211 |
| Average used price | £28,990 | £30,993 |
| Recent used-price trend | Up 20% over ~6 months | Up 11.3% over ~6 months |
Used prices are indicative figures gathered from independent UK dealer listings and change frequently.
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 - BMW iX xDrive40
Tested 2025
Adult Occupant91%
Child Occupant87%
Vulnerable Road Users73%
Safety Assist81%
Full result on euroncap.com (opens in new tab)
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)
Warranty
Check the published battery warranty cover for each selected trim.
| Measure | BMW iXxDrive40 | BYD Sealion 7Comfort |
|---|---|---|
| Battery warranty | 8 years | 8 years |
| Battery warranty distance | 160,934 km | 250,000 km (better) |
Buying options
Get a quote
BMW iX
Used on AutoTraderLease deals
BYD Sealion 7
Used on AutoTraderLease deals
Live used listings
Active inventory from independent UK dealers.
BMW iX
- £31,6302021Car360View
- £26,3502022Anchor CarsView
BYD Sealion 7
No active listings.
Frequently asked questions
Is the BMW iX worth the extra £24,915 over the BYD Sealion 7?
The BMW iX costs £24,915 more than the BYD Sealion 7. For that premium it adds a 2.1s quicker 0-62mph time. The BYD Sealion 7 is not just cheaper - it also offers 43 miles more WLTP range. On EVcarsguide's combined category scores, the BYD Sealion 7 comes out ahead overall.
Which is cheaper to own over 5 years, the BMW iX or the BYD Sealion 7?
The BYD Sealion 7 is £24,915 cheaper to buy. Running costs are almost identical - about £200 a year either way, at 8,000 miles on an off-peak home tariff. Add 5 years of charging and the BYD Sealion 7 comes out roughly £24,835 cheaper overall. These figures cover list price and home charging only - insurance, servicing, tyres and depreciation will move the real total.
What are the BMW iX and BYD Sealion 7 like on a long motorway trip?
EVcarsguide estimates a real-world motorway range of about 214 miles for the BMW iX and 204 miles for the BYD Sealion 7 - effectively matched, and both well below their WLTP figures because sustained high speed is the hardest case for an EV. A rapid charge to 80% takes around 35 minutes in the BMW iX and 24 in the BYD Sealion 7, so the BYD Sealion 7 loses less time at each stop.
Which is easier to park and drive in town, the BMW iX or the BYD Sealion 7?
The BYD Sealion 7 is the easier car for tight UK car parks: it is 45 mm narrower than the BMW iX. In a standard 2,400 mm bay that leaves about 475 mm of total clearance for the BYD Sealion 7 and about 430 mm of total clearance for the BMW iX. The BYD Sealion 7 also turns in a 1.1 m tighter circle, which helps with U-turns and multi-storey ramps.
Which battery will hold up better as a used buy, the BMW iX or the BYD Sealion 7?
Over a 8-year ownership window EVcarsguide's degradation model projects roughly 84% battery health for the BMW iX and 90% for the BYD Sealion 7. That gives the BYD Sealion 7 a modest edge in retained real-world range. The BYD Sealion 7's LFP-type pack tolerates daily 100% charging, while the BMW iX's NMC-type pack lasts longest kept to about 80% for everyday use. Both batteries carry a 8-year manufacturer warranty.
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 BMW iX comparisons
More BYD Sealion 7 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 BMW iX and BYD Sealion 7 rank among the best family EVsWhere the BMW iX and BYD Sealion 7 rank among the best electric SUVsWhere the BMW iX and BYD Sealion 7 rank among the best motorway EVsWhere the BMW iX and BYD Sealion 7 rank among the best city EVsWhere the BMW iX and BYD Sealion 7 rank among the cheapest EVs to runWhere the BMW iX and BYD Sealion 7 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.
GuideBuying a Used BMW iX (2021 on): xDrive40 vs xDrive50, Recalls, Insurance & What to Pay
A used BMW iX buyer’s guide: xDrive40, xDrive50 and M60 against the 2025 xDrive45 and xDrive60, the range gap, battery and airbag recalls, insurance, battery warranty left, what owners report, what to pay and a printable checklist.
GuideBuying a Used BYD Sealion 7 (2025 on): Comfort, Design or Excellence & What to Pay
A used BYD Sealion 7 buyer’s guide: Comfort RWD, Design AWD and Excellence AWD, the steep depreciation, BYD’s 8-year battery warranty, charging speeds, real-world range, what owners report and a printable checklist.
Data accuracy
Specs are sourced from manufacturer websites and manually reviewed. These figures were last verified .