BYD Seal U vs Kia EV6 UK: £10,640 apart - plug-in hybrid value or long-range electric?
The BYD Seal U DM-i is a plug-in hybrid from £34,995; the Kia EV6 is a battery-electric car from £45,635 with 361 miles WLTP. We compare UK price, range, charging, warranty, safety and what Chinese owners report about the Seal U's sister car.
The verdict
Two answers to one budget question. The Seal U DM-i is the cheaper plug-in hybrid, with petrol backup but 43-78 miles of electric running. The EV6 costs £10,640 more and is fully electric, with 361 miles WLTP and a longer vehicle warranty. If you can charge at home and want to stop buying petrol, the EV6 is the stronger buy.
Buy the BYD Seal U if
Your budget stops near £35,000, you cannot charge reliably at home, or you cover long motorway trips and want petrol backup rather than charging stops.
Buy the Kia EV6 if
You can charge at home or work, want to drive fully electric, and value a 361-mile WLTP range and 7-year / 100,000-mile warranty enough to pay £45,635.
| Dimension | BYD Seal U | Kia EV6 |
|---|---|---|
| UK entry price | BYD Seal U£34,995Better here | Kia EV6£45,635 |
| Electric range | BYD Seal U43-78 mi WLTP electric-only | Kia EV6361 mi WLTPBetter here |
| Rapid charging | BYD Seal U18 kW DC peak | Kia EV610-80% in 18 min on a 260 kW+ chargerBetter here |
| Vehicle warranty | BYD Seal U6 yr / 93,750 mi | Kia EV67 yr / 100,000 miBetter here |
| Battery warranty | BYD Seal U8 yr / 155,350 mi (confirm terms)Better here | Kia EV68 yr / 100,000 mi |
| Euro NCAP | BYD Seal U5 stars (2023) | Kia EV65 stars (2022) |
China-side evidence
What the Chinese market tells us about the Seal U
The UK Seal U DM-i is the export version of the China-market BYD Song PLUS DM-i (宋PLUS DM-i), a plug-in hybrid SUV on sale in China since 2021 and facelifted in 2023. That gives UK buyers years of Chinese owner complaints on the same basic car. On the complaint site CheZhiWang (车质网), owners give the Song PLUS new-energy range a 2.5 out of 5 satisfaction score, with recurring complaints about body electrics, suspension and tyre wear, and body sealing. None of that is guaranteed to carry over to the right-hand-drive UK car, but it is the strongest early signal available. This block covers the Seal U only: the Kia EV6 is a Korean car, and the competitor data we reviewed holds no China-side owner evidence for it, so we have put no figures against it here.
Owner reports, complaint records and recall notices from the Chinese market, each with the source and the date we read it. Sample sizes are small; read them as signals, not survey results.
UK essentials: the numbers side by side
These two cars answer the same question in different ways. The BYD Seal U DM-i is a plug-in hybrid: a petrol engine plus a battery good for 43 to 78 miles of electric running, depending on trim, priced from £34,995 to £39,995 on the road (BYD UK, accessed 5 July 2026). The UK does not get the electric Seal U sold in continental Europe. The Kia EV6 is fully battery-electric, from £45,635 on the road for the entry Air with an 84.0 kWh battery and rear-wheel drive (Kia UK, 13 September 2026). That puts £10,640 between the two entry prices. All range figures on this page are WLTP, and the Seal U's are electric-only figures, so they are not a like-for-like total range comparison.
| Attribute | BYD Seal U | Kia EV6 |
|---|---|---|
| UK entry price | BYD Seal U£34,995 (Boost) to £39,995 (Design), on the road (BYD UK, accessed 5 July 2026) | Kia EV6£45,635 on the road for the Air 84.0 kWh RWD (Kia UK, 13 September 2026) |
| Euro NCAP rating | BYD Seal U5 stars (December 2023, tested as the electric Seal U; PHEV added 2024): adult 90%, child 86%, vulnerable road users 83% | Kia EV65 stars (2022, LHD AWD tested; kept after 2024 facelift review): adult 90%, child 86%, vulnerable road users 64% |
| powertrain | BYD Seal UDM-i plug-in hybrid (petrol plus electric); the UK gets no electric-only Seal U | Kia EV6Battery electric (BEV); 225 bhp RWD or 320 bhp AWD, both with an 84.0 kWh battery |
Price, company-car tax and running costs
The Seal U undercuts the EV6 by £10,640 at entry level, and even the top Seal U Design at £39,995 costs less than the cheapest EV6. Company-car drivers should look past list prices, though. Comcar estimates the Seal U at about £43 a month in Benefit-in-Kind (BiK) tax for a 20% taxpayer in 2026/27, on a P11D value of about £36,825; treat that as an estimate and check your own figure. The EV6's BiK figure is not in the data we reviewed, so we have not calculated one. Private buyers should note that the Seal U's official 235-707 mpg depends on regular charging: Auto Express reports around 35 mpg on the motorway once the battery is flat. The EV6 uses no petrol, so its running costs depend on your electricity tariff. The Seal U sits in insurance group 32 (Boost, Comfort) or 40 (Design); the EV6's group is not in our data.
| Attribute | BYD Seal U | Kia EV6 |
|---|---|---|
| company-car tax | BYD Seal UAbout £43/month for a 20% taxpayer in 2026/27 (P11D about £36,825), per Comcar (July 2026); check your own figure | Kia EV6Not published in the competitor data we reviewed (September 2026) |
Also noted
- BYD Seal U insurance groupGroup 32 (Boost, Comfort); group 40 (Design)
- BYD Seal U real-world fuel economyOfficial 235-707 mpg needs regular charging; about 35 mpg reported on the motorway with the battery depleted (Auto Express, April 2026)
Range and charging: how you live with each car
This is where the two cars differ most. The EV6 Air is rated at 361 miles WLTP combined (475 miles on the WLTP city cycle), which covers most weekly driving on one charge. Kia UK does not publish a peak DC charging rate; it quotes 10-80% in 18 minutes, but only on an 800V charger delivering at least 260 kW, so expect longer on slower public charge points. The Seal U gives 43 to 78 miles of electric-only running depending on trim, then the petrol engine takes over, so a long trip needs no charging stops at all. Its charging is slow by comparison: 18 kW DC and 11 kW AC, with 30-80% taking 35 minutes on the 18.3 kWh battery or 55 minutes on the 26.6 kWh pack (What Car?, April 2025). The two makers quote different charge windows, so the times are not like-for-like.
| Attribute | BYD Seal U | Kia EV6 |
|---|---|---|
| longest electric range | BYD Seal UBoost 50 miles, Comfort 78 miles, Design 43 miles WLTP electric-only (BYD UK, accessed 5 July 2026) | Kia EV6361 miles WLTP combined, 475 miles WLTP city, for the Air on 19-inch wheels (Kia UK, 13 September 2026) |
| DC charging | BYD Seal U18 kW DC peak, 11 kW AC; 30-80% in 35 min (18.3 kWh) or 55 min (26.6 kWh) | Kia EV6Peak DC rate not published by Kia UK; 10-80% in 18 min quoted on an 800V charger of at least 260 kW |
| battery capacity | BYD Seal U18.3 kWh (Boost, Design) or 26.6 kWh (Comfort) | Kia EV684.0 kWh on RWD and AWD (Kia UK does not say whether gross or usable) |
Warranty, dealers and what happens when something goes wrong
Kia's standard cover is longer on the car itself: 7 years or 100,000 miles, against BYD's 6 years or 93,750 miles. On the battery the order flips. Kia covers the EV6's high-voltage battery for 8 years or 100,000 miles with 70% capacity retention, for cars registered from 1 January 2024. BYD announced on 15 January 2026 an 8-year / 250,000 km (about 155,350-mile) Blade Battery warranty for Super Hybrids and BEVs in Europe, including existing UK cars, but its general UK policy page still lists 125,000 miles. Even the lower figure beats Kia's mileage cap, but ask BYD for the VIN-specific terms in writing. BYD UK had 125 franchised dealerships across 38 retail partners by December 2025.
| Attribute | BYD Seal U | Kia EV6 |
|---|---|---|
| vehicle warranty | BYD Seal U6 years / 93,750 miles (Carwow, January 2026) | Kia EV67 years / 100,000 miles (Kia UK, 13 September 2026) |
| battery warranty | BYD Seal U8 years / 155,350 miles, 70% capacity, per BYD Europe (15 January 2026); BYD's UK policy page still says 125,000 miles, so confirm terms | Kia EV68 years / 100,000 miles, 70% capacity, for EVs registered from 1 January 2024 (Kia UK, 13 September 2026) |
Also noted
- BYD UK dealer network125 franchised dealerships across 38 retail partners (December 2025)
Honest pros and cons
The Seal U buys you a lower price, a lot of standard kit and freedom from charging anxiety, but UK testers find the chassis soft and the steering vague, its rapid charging is slow, and its Chinese sister car's owner record is a caution. On owner satisfaction, Carwow reports BYD 30th of 31 brands in its 2025 survey and the Seal U 16th of 30 models in 2026; these are separate surveys. The EV6 buys you a long WLTP range, much faster charging and a longer warranty on the car, but it costs over £10,000 more, Kia UK does not publish its peak charging rate, and its 2022 Euro NCAP score for vulnerable road users is 64% against the Seal U's 83%.
Frequently asked questions
- How much cheaper is the BYD Seal U than the Kia EV6?
- The BYD Seal U DM-i starts at £34,995 for the Boost, on the road. The Kia EV6 starts at £45,635 for the Air 84.0 kWh RWD, so the gap at entry level is £10,640.
- Is the BYD Seal U electric like the Kia EV6?
- No. The UK Seal U is a DM-i plug-in hybrid with a petrol engine and 43 to 78 miles of WLTP electric-only range depending on trim. The EV6 is fully battery-electric, with 361 miles WLTP for the Air.
- Which charges faster, the Seal U or the EV6?
- The EV6. Kia quotes 10-80% in 18 minutes on an 800V charger delivering at least 260 kW. The Seal U peaks at 18 kW DC, with 30-80% taking 35 or 55 minutes depending on battery size.
- Which has the better warranty?
- Kia covers the car for longer: 7 years or 100,000 miles, against 6 years or 93,750 miles for the Seal U. On the battery, BYD quotes 8 years and 155,350 miles against Kia's 8 years and 100,000 miles, but BYD's UK policy page still says 125,000 miles, so confirm the terms.
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