BYD Seal U DM-i Review

The Seal U DM-i is a five-seat plug-in hybrid SUV positioned against the MG HS Plug-in Hybrid, Kia Sportage PHEV, Hyundai Tucson Plug-in Hybrid, Ford Kuga PHEV and Volkswagen Tiguan eHybrid.

Despite the name, it is not simply an SUV version of the electric BYD Seal saloon. It has a taller body, a more practical cabin and a petrol-electric powertrain intended to cover everyday journeys on battery power while retaining the flexibility of an internal-combustion engine.

DM-i refers to BYD’s Dual Mode plug-in hybrid system. At low speeds and under lighter loads, the electric motor handles most of the work. The petrol engine can generate electricity, assist the motor or drive the wheels more directly when greater performance or sustained higher speeds demand it.

There are three versions. Boost uses an 18.3kWh Blade Battery, a naturally aspirated 1.5-litre petrol engine and a single electric motor driving the front wheels. Comfort uses the same basic powertrain but replaces the battery with a larger 26.6kWh unit, increasing the official electric range from 50 to 78 miles.

Design returns to the smaller battery but gains a turbocharged petrol engine and a second electric motor on the rear axle. This provides four-wheel drive and increases total power to 324PS, although the official electric range falls to 43 miles.

Comfort is the most convincing expression of the Seal U DM-i concept. Its battery is large enough to cover many commutes and school runs without using petrol, yet the engine removes the need to plan charging stops on longer journeys.

That advantage depends on regular charging. Run it habitually with an empty battery and it becomes a heavy petrol SUV carrying electrical hardware it is not using effectively. Buyers without convenient access to a home or workplace charger may be better served by a conventional full hybrid.

The cabin is spacious, comfortable and impressively finished for the price. Standard equipment is extensive across the range, so the three versions are defined more by their powertrains than by a conventional walk-up in luxury.

The driving experience is less accomplished. The Seal U is easy to operate in town and stable on the motorway, but rougher roads expose suspension that can sound and feel unsettled. Its steering is light rather than communicative, so buyers looking for an engaging family SUV will find stronger alternatives.

The Seal U DM-i Comfort is the version to choose. It costs £36,995 and combines the front-wheel-drive powertrain with the larger 26.6kWh battery, giving it an official electric range of 78 miles.

That is 28 miles more than the entry-level Boost and makes a significant difference in everyday use. Drivers with a home charger may be able to complete an entire working week of short journeys without starting the petrol engine, depending on their mileage, driving style and the weather.

Comfort does not sacrifice useful equipment or everyday performance. It has the same 218PS combined output and 8.9-second 0-62mph time as Boost, which is adequate for a family SUV.

Design is much faster and adds four-wheel drive, but its 324PS output is more than most buyers need. The smaller battery also reduces the official electric range to 43 miles, undermining one of the Seal U’s strongest qualities.

Boost is worth considering when the lower purchase price matters more than maximum electric range. Its 50-mile figure remains useful, but Comfort is better placed to deliver the low fuel consumption that makes a plug-in hybrid worthwhile.

The BYD Seal U DM-i Boost costs £34,995. Comfort is £36,995, while Design is priced at £39,995.

The £2,000 step from Boost to Comfort pays for the larger 26.6kWh battery and increases the official electric range from 50 to 78 miles. For drivers able to charge regularly, that is the most worthwhile upgrade in the range.

Design costs £3,000 more than Comfort. It adds the turbocharged engine, rear electric motor and four-wheel drive, increasing output to 324PS and cutting the 0-62mph time to 5.9 seconds. The trade-off is a smaller battery and a 43-mile official electric range.

All three versions have a high standard specification, so there is little need to budget for major option packs. Metallic paint, 19-inch wheels, a panoramic roof, electrically adjustable heated and ventilated front seats, a powered tailgate and a 360-degree camera are included.

The pricing compares favourably with several established plug-in hybrid SUVs. Finance and leasing support can alter the relative value, however, so buyers should consider the customer deposit, interest rate, contract length, annual mileage, optional final payment and any fees rather than relying on the headline monthly figure.

The MG HS Plug-in Hybrid is one of the closest alternatives. It offers a large cabin, a bigger boot and a competitive electric range. The BYD’s interior feels more distinctive, however, and the Comfort version travels further officially on battery power.

The Kia Sportage Plug-in Hybrid has a more established dealer network, a larger boot and a more polished driving experience. Its seven-year warranty is also attractive, but comparable versions can cost more.

The Volkswagen Tiguan eHybrid is a particularly relevant alternative. It has a more polished chassis, a practical cabin and a long electric range in its latest form, but it is likely to cost more once the specifications are aligned.

The raised driving position provides a clear view of the road ahead and makes the Seal U easy to get into. It feels like a proper SUV rather than a slightly taller hatchback, without requiring occupants to climb up into the cabin.

Electric adjustment is standard for both front seats, making it easy to find a comfortable position. Heating and ventilation are also included, along with a heated steering wheel.

The seats provide good comfort on longer journeys, although stronger side support would be welcome. Their relatively smooth synthetic leather surfaces allow occupants to move around slightly when the car leans through tighter bends.

Forward and side visibility are good, but the rear screen is narrow and restricts the view over the driver’s shoulder. Front and rear parking sensors, a reversing camera, rear cross-traffic alert and a 360-degree camera are standard, reducing the practical effect.

Storage is generous. There is space beneath the centre console, a covered compartment under the armrest, useful door pockets and twin cupholders. Wireless phone charging is also standard.

Rear legroom is a strength. Two adults can sit behind tall front occupants without feeling cramped, while the flat floor gives the middle passenger more usable foot space than in many petrol SUVs.

Shoulder room is also good, although the gently sloping roof can reduce headroom for particularly tall passengers. Children and average-height adults should have no difficulty.

Isofix child-seat mounting points are fitted to the front passenger seat and both outer rear positions. The broad door openings and raised bench make fitting a child seat straightforward.

The boot holds 425 litres with the rear seats upright. That is enough for a weekly shop, a pushchair or several suitcases, but it is noticeably smaller than the luggage areas in the Kia Sportage and several other family SUVs.

A height-adjustable floor can align with the loading lip, although it does not create meaningful extra storage beneath. There is no dedicated charging-cable compartment, so the cables need to sit in the side recesses or share space with luggage.

Folding the 60:40 split rear seatbacks increases capacity to 1,440 litres. They leave a step in the extended floor, making long or heavy items harder to slide into place than they would be in a completely flat load area.

At 4,775mm long, 1,890mm wide and 1,670mm high, the Seal U DM-i is a substantial family SUV. It is longer than a Kia Sportage or Hyundai Tucson, although the cabin and boot do not make full use of that additional exterior length.

Light steering and a reasonable turning circle make it manageable around town. The standard parking sensors and 360-degree camera are particularly useful in narrow spaces, where its width and restricted rear visibility are more noticeable.

The centre of the dashboard is dominated by a 15.6-inch touchscreen that can rotate electrically between landscape and portrait orientations.

The mechanism remains a conversation piece, but it has some practical value when switching between different types of information. Landscape suits media and smartphone mirroring, while portrait provides a taller map view when using BYD’s navigation.

Apple CarPlay and Android Auto work with the screen in landscape orientation. Both provide an easier route to familiar navigation and audio apps than BYD’s native menus.

The display responds quickly, and shortcut controls reduce the number of steps needed for some functions. Even so, the interface is less intuitive than the best rival systems.

Climate control is operated through the touchscreen. Basic temperature shortcuts remain visible, but changing the airflow direction or accessing seat heating and ventilation requires more attention than a bank of physical switches would demand.

A 12.3-inch digital instrument display sits ahead of the driver and presents the essential information clearly. A head-up display is also standard, reducing the need to look away from the road for speed and navigation guidance.

The ten-speaker Infinity audio system provides clear sound, while USB connections and wireless phone charging cover most device needs. Voice control is included, although its usefulness depends on the type and wording of the command.

The quantity of technology is impressive for the price. Its execution is not yet as polished as the systems in the latest Volkswagen Tiguan or Kia Sportage.

Synthetic leather upholstery is standard across the range, with heating, ventilation and electric adjustment for the front seats.

Soft-touch finishes cover most of the dashboard and door tops, while stitching and metallic-effect details prevent the cabin from appearing plain. There is little obvious difference in material quality between the three versions.

The design is less playful than the BYD Atto 3’s interior, but it remains more distinctive than many family SUVs. The tested car also felt solidly assembled, with no obvious creaks or rattles over poor surfaces.

Boost and Comfort use a naturally aspirated 1.5-litre petrol engine with a front-mounted electric motor. The electric motor handles much of the everyday propulsion, while the engine generates electricity or supports the system when required.

Both produce a combined 218PS and drive the front wheels. Their 8.9-second 0-62mph time is adequate rather than exciting, with enough performance for joining a motorway or overtaking when a suitable gap is available.

The difference is battery capacity. Boost has an 18.3kWh battery and a 50-mile official electric range, while Comfort’s 26.6kWh unit raises that figure to 78 miles.

Design uses a turbocharged version of the petrol engine and adds a rear motor. Total output rises to 324PS, four-wheel drive becomes standard and the 0-62mph time falls to 5.9 seconds.

That performance is stronger than most family buyers need. The 18.3kWh battery also limits Design to 43 official electric miles, making it less efficient for drivers whose priority is covering daily journeys without petrol.

The system moves between electric and hybrid operation smoothly. In EV mode, the car prioritises battery power until the charge reaches its lower reserve. Hybrid mode allows the petrol engine to manage energy more flexibly.

The Seal U DM-i feels most comfortable in towns and on motorways. Light steering, smooth initial acceleration and the surround-view camera make it easy to handle in traffic, while the suspension deals competently with speed humps.

Electric running is quiet and relaxed. The petrol engine joins in without an obvious jolt, and it is often difficult to identify the exact point at which the powertrain switches between its operating modes.

The engine remains subdued during normal driving. It becomes more vocal under hard acceleration, but its note is smoother and less strained than those of some rival plug-in hybrids.

The brake pedal is another strength. The transition between regenerative braking and the conventional brakes is progressive, making smooth stops easier than in many petrol-electric cars.

Country roads expose the chassis more clearly. The suspension can produce noticeable thumps over broken surfaces and does not settle as quickly as it should after a sequence of bumps.

This is more irritating than genuinely uncomfortable, but it encourages the driver to reduce speed. A Ford Kuga feels more controlled, while a Hyundai Tucson isolates its occupants from poor surfaces more effectively.

The light steering provides little feedback and the seats lack strong lateral support, so the Seal U is not rewarding to drive quickly. Design’s extra power and four-wheel drive improve acceleration and traction rather than agility.

Motorway stability is good, with little sensitivity to crosswinds. Some wind noise develops around the door mirrors and windscreen pillars, while tyre and suspension noise are more noticeable over coarse surfaces. Overall refinement remains competitive.

The BYD Seal U received a five-star Euro NCAP rating in 2023. Additional checks carried out in 2024 confirmed that the rating also applies to the plug-in hybrid Seal U DM-i.

The assessment recorded scores of 90 per cent for adult occupant protection, 86 per cent for child occupant protection, 83 per cent for vulnerable road-user protection and 77 per cent for safety assistance.

Standard equipment includes automatic emergency braking, adaptive cruise control, blind-spot monitoring, lane-keeping assistance, front and rear cross-traffic braking, door-opening warning, traffic-sign recognition and driver-fatigue monitoring.

Front, side and curtain airbags are fitted, along with a centre airbag designed to reduce contact between the front occupants during a side impact.

Euro NCAP found that the automatic emergency braking system generally performed well when reacting to other vehicles. The lane-support system can intervene when the car drifts from its lane and in more critical situations.

A plug-in hybrid’s fuel consumption depends heavily on how it is used. Official combined figures assume the car begins with a charged battery and completes a significant proportion of the test on electric power.

Boost has an official electric range of 50 miles, while Comfort increases this to 78 miles. Drivers with a home charger and a commute within those limits may use little petrol during the working week.

Design’s 43-mile range is less generous but remains sufficient for many local journeys. Its extra motor, performance and weight make it less economical once the battery is depleted.

When running primarily on petrol with a low battery, buyers should expect economy closer to that of a conventional large petrol SUV than the eye-catching weighted figures quoted for plug-in hybrids.

BYD quotes a maximum DC charging speed of 18kW. The smaller 18.3kWh battery can be charged from 30 to 80 per cent in around 35 minutes under suitable conditions.

DC charging is unusual in this part of the plug-in hybrid market and may be useful during a longer journey. It is unlikely to be the cheapest or most convenient way to charge routinely, however.

AC charging is more relevant for most owners. Plugging in at home overnight gives the powertrain the best opportunity to deliver its intended savings. The exact time depends on the available supply, battery size, temperature and starting charge.

Electricity bought on an off-peak home tariff is generally much cheaper than energy from a public rapid charger. Buyers unable or unwilling to charge regularly may be better served by a full hybrid that does not carry a large plug-in battery.

The Seal U DM-i has a six-year or 93,750-mile vehicle warranty, whichever comes first.

Its electric drive unit is covered for eight years or 93,750 miles, while the Blade Battery is covered for eight years or 125,000 miles. The applicable battery-capacity conditions and exclusions are detailed in BYD’s warranty documentation.

Boost and Comfort sit in insurance group 32, while the faster four-wheel-drive Design is in group 40.

The difference reflects Design’s 324PS output and greater mechanical complexity. It is likely to cost noticeably more to insure, particularly for younger drivers.

Insurance availability can vary for newer manufacturers as providers build repair and claims data. Buyers should obtain quotes for the exact version and registration before committing to a purchase, lease or finance agreement.

The standard annual Vehicle Excise Duty rate after the first year is £200.

The Expensive Car Supplement applies to petrol, diesel and plug-in hybrid cars with an original list price above £40,000. All three standard Seal U DM-i versions currently sit below that threshold.

Factory-fitted options count towards the original list price, so a car specified above £40,000 may become liable. Where it applies, the £440 annual Expensive Car Supplement is charged for five years from the second licence.

The threshold is based on the original list price rather than a retailer discount, finance contribution or later used value.