From £47,0006

Chinese giant aims straight at the Tesla Model Y with its new electric family SUV

BYD is the latest Chinese car brand to have decided that the most effective route to making money in Europe is via a mid-sized, £50,000, all-electric crossover. And so, here to try to force its way in alongside the Tesla Model Y, Hyundai Ioniq 5, Polestar 2 and more comes the BYD Sealion 7.

This is BYD’s first car in Europe to adopt new powertrain and platform technology, taking on-road performance and rapid-charging capabilities to new heights. It’s supposed to be the first member of a family of Sealion SUV models, although BYD hasn’t said whether there will be larger ones than this, or if the 7 is as big as they will get. As we will come to explain, the Sealion 7 certainly isn’t small by its own particular class’s standards.

Like many of its rivals, this car offers single- and dual-motor derivatives, the latter especially taking power, torque and performance well into the realms of the excessive. It uses BYD’s proprietary battery technology and, unlike most of its rivals, is powered exclusively by lithium-iron-phosphate cells, for which BYD claims plenty of notional and technical advantages over more class-typical nickel-manganese-cobalt ones. 

So the Sealion 7 is the SUV version of the Seal saloon (what the Tesla Model Y is to the Model 3) and the brand's fourth all-electric model in the UK. It’s not to be confused with the Seal U, which is a slightly smaller SUV that’s mechanically completely different. We elected to test an entry-level, single-motor Comfort-spec model.

Advertisement

DESIGN & STYLING

7
BYD Sealion 7 review 2025 002

The Sealion 7 is the taller, more practical cousin of the BYD Seal saloon. The car’s overall length, width and wheelbase are all within an inch or so of the saloon’s equivalents and two out of three versions of it are powered by the same 82.5kWh Blade drive battery.

The car is only 1620mm tall, so it’s slightly lower than either a Tesla Model Y or a Volkswagen ID 4. The Design AWD model has ground clearance of 163mm, so it’s clearly not something intended for adventures off the beaten track.

Despite increasingly sophisticated technology for the drive batteries, EVs have tended to stick with old-school lead-acid batteries for the 12V system, but the Sealion 7 switches that to LFP too. It comes with an eight-year warranty and shouldn’t run down when you leave the car stationary for long periods of time.

That Blade battery is packaged in what BYD calls a cell-to-body pack that forms a stressed structural part of the car’s all-steel unitary chassis (most underfloor batteries are, by contrast, isolated from the structure around them). Its cells work better at extremes of temperature than NMC equivalents, says BYD; they can tolerate a greater number of charge/discharge cycles before significantly degrading; and, containing no cobalt, they can be manufactured without the ethical concerns associated with cobalt mining.

The Sealion 7 is built on the same e-Platform 3.0 underpinnings as almost all of BYD’s other models so far, though it’s the first one to come to Europe that benefits from the platform’s ‘evolution’ refinements announced last year. And those refinements allow the range-topping Excellence AWD version to adopt an 800V electrical architecture, which allows it faster rapid-charging speeds for its 91.3kWh battery.

All versions of the car use a new primary rear-mounted drive motor that can spin at up to 23,000rpm. It produces similar outright power to, but slightly more torque than, the equivalent in a Seal, but the biggest difference made is to top speed, which is extended to 133mph even in the entry-level Sealion 7 (up from 112mph in the Seal).

There are three Sealion 7 derivatives: single-motor Comfort with 309bhp and an 82.5kWh battery; the dual-motor Design AWD with an additional asynchronous front motor, 523bhp and the same battery pack; and the Excellence AWD with the same motors as Design-spec cars but the bigger battery and 800V architecture (DC charging is up to 230kW, compared with a 150kW limit for the lesser models).

Suspension is class-typical: double wishbones at the front axle, multiple links at the rear, steel coils all round, and every model fitted with passive frequency-selective dampers.

BYD’s LFP battery tech doesn’t seem to save much weight. The entry-level car’s claimed 2225kg rises to 2435kg for the Excellence AWD. Horiba MIRA’s weighbridge wasn’t available for our test but – in the Comfort-spec model’s case, at least – it is about what we would expect for a steel car at the larger end of the mid-sized electric SUV class.

INTERIOR

8
BYD Sealion 7 review 2025 010

BYD is building a reputation for having interiors with impressive tactile quality. The firm’s experimental early efforts (remember the guitar string-inspired door bins of the Atto 3 that you could actually twang?) have given way to a more conventional approach, although for the Sealion 7 it has certainly produced a cabin with plenty of space, plenty of quality feel, and some noticeably expensive highlights.

The driver sits quite upright, bent-legged and ‘over the controls’, in a position that tells you right away that BYD wants to make access easy and comfort a priority – and doesn’t much mind if the end result doesn’t feel sporty.

At 6ft 3in tall, I had to recline the seatbacks to have enough head room in the back, and also noticed the effect the high floor was having on the position of my legs. I don’t remember having these issues seven years ago in the Jaguar I-Pace – and that car was 6in shorter than this one.

The front seats are large and comfortable, though they have integrated-style headrests that you can’t move, and aren’t quite as widely adjustable as some in the class. Comfort and Design versions come with synthetic leather upholstery that is pretty convincing and pleasant to the touch, and used widely around the doors and on the dashboard as well as on the seats. If you go for an Excellence model, you get real hide.

Unlike on some rivals we have tested recently, there’s a decent count of physical secondary controls. The centre console includes a swish-looking cut-glass drive selector; knurled-effect chrome switches for drive mode, regen selection and audio volume; and some heating and ventilation controls, although most are accessed through the touchscreen. There are some useful controls on the steering wheel spokes, too, and chunky, no-nonsense interior door release pulls that feel like the antidote to so many annoyingly fashionable, electronic microswitch-style ones. Some of the car’s interior features – the multicoloured ambient lighting in particular – don’t manage to make it look and feel upmarket, but many do, feeling solid and working well.

The second-row seats certainly look airy and open thanks to the standard-fit glass roof, though the arcing roofline and the way the battery affects leg room erode the amount of passenger space they deliver. There’s enough for average-height adults to feel well provided for, but some rivals do better.

Multimedia - 3.5 stars

It’s a sign of how much investment manufacturers are pouring into their in-car digital technology that a 15.6in touchscreen console – that rotates from portrait to landscape, as you prefer – doesn’t feel like such a notable feature any more.

BYD has clearly been working on the presentation and usability of the system. It has bigger nav bar icons than previous efforts; gives better access, in and out of smartphone mirroring mode; and manages to group most ADAS controls on a customisable, quick-access swipe-down menu. Annoyingly, though, it continues to bury the driver monitoring system controls elsewhere. That is probably the system you’re most likely to want to turn off, since it’s annoyingly quick to nag. We would still prefer physical HVAC controls, and shorter lists of functions through which to scroll to find a particular toggle.

We would also prefer a bit more flexibility in the layout of the system – you can only have it in landscape mode while you’re using Apple CarPlay, for example. It would also be good if the screen didn’t rotate of its own accord when the car corners hard. It can be a badly timed distraction, though it only happened for us during limit handling testing on track.

ENGINES & PERFORMANCE

7
BYD Sealion 7 review 2025 022

The single-motor Sealion 7 falls roughly in the middle of its class for outright power and acceleration. There are quicker options for similar outlay, but plenty of slower ones too. And then there’s the dual-motor model, if you’re willing to spend 10% more.

The Comfort model can therefore probably afford the sort of ample and assured, if slightly unremarkable, performance level it has. Our test car hit 60mph from rest in 6.5sec on a dry test day, without seeming to rush off the line, and while maintaining plenty of composure and comfort. It took 5.2sec to go from 30-70mph and a decently assertive 4.9sec from 50-80mph. While a Tesla Model Y Rear-Wheel Drive is about a second quicker on both of these ‘roll-on’ benchmarks – more revealing about real-world pace than standing starts – a single-motor Kia EV6 is more than a second slower.

There's a bit of lag when you floor the accelerator and the brake pedal is slightly spongy, but overall drivability is well-resolved.

So the Sealion 7’s drive motor does indeed lend it strongish motorway pace when you need it. There’s less control over regenerative braking than some rivals offer – just Standard and High settings, without a one-pedal setting or a full coasting one (though Standard keeps trailing-throttle regen fairly low). The brake pedal is soft but decently progressive, and lets you feel where the limits of motor regen are, and where the friction brakes are coming into play.

The car doesn’t make any imitation combustion noises – not for the benefit of its occupants, at any rate – although the ‘pedestrian warning’ noise it broadcasts to the outside world at low speeds is a slightly haunting mix of tinkling wind chimes that is barely audible from the driver’s seat but nonetheless makes you wonder why pedestrians are looking at you like that.

BYD’s LFP drive battery did, however, suffer from more ‘charge drain’ degradation to its performance level at a low state of charge than we found when we tested the Dolphin Surf earlier in the year. 0-60mph acceleration dropped from 6.5sec to 11.5sec below 10% charge, which is much more than the few tenths of a second we typically see.

This could simply be deliberate powertrain tuning – the Sealion 7’s way of telling you to stop and power up – or it could be because the car keeps effectively no battery capacity in reserve. BYD didn’t confirm either way when asked to comment, but the reality of the situation certainly makes you feel more vulnerable than you might when charge is low.

RIDE & HANDLING

6
BYD Sealion 7 review 2025 021

There are no surprises, and few particularly noteworthy accomplishments, to report here. The Sealion 7 has the medium-soft ride and fairly sedate, inert handling you would expect of a bigger family car, and of one of the bigger and heavier EVs in its class, possessed of a comfort-first agenda. It’s a pity, however, that the ride isn’t better resolved out of town, in order to allow for smoother cruising comfort.

The car feels fairly gently sprung and laid back at low speeds, and its long wheelbase, wheel-at-each-corner stance and at-least-relatively low centre of gravity all prevent it from pitching, lolling or rolling around over bigger rises, through hollows and around corners taken at greater speed. As such, it’s a benign-handling car, though it fails to register as much more than adequate as any kind of enticing driving experience. 

It feels comfortable and well isolated around town, but body control starts to get more animated over sleeping policemen, as it begins to joggle its weight laterally rather than remaining level and settled.

That restive excitability in the ride builds into a bigger factor at A- and B-road speeds, at which the car’s frequency-selective dampers seldom seem to find just the right amount of response to keep it from fidgeting and rotating around its rear axle. The problem is only serious enough to take the edge off comfort levels, though, and to continually communicate the car’s mass, and seldom to allow it to feel dependably connected with the road underneath it – rather than to meaningfully disturb its stability at speed.

The electronic stability control system can be deactivated at very low speeds, but switches itself back on as you pass about 20mph. It isn’t the most intrusive system but works well enough to keep the car’s chassis reined in.

Assisted Driving - 3 stars

BYD’s active driver assistance systems remain a bit of a mixed bag. When we tested the Atto 3 in 2023, the car’s lane keeping seemed unintrusive to the point that you wondered if it actually did anything at all, whereas its adaptive cruise control was overly cautious and a little unresponsive.

The Sealion 7’s systems seem at least a little more advanced. Both lane keeping and speeding reminder buzzers can be turned off fairly quickly, but neither is all that irksome by prevailing norms.

The pedestrian detection and low-speed crash avoidance systems are a bit over-sensitive, the latter given to over-reacting by jamming on the brakes unnecessarily when you’re manoeuvring – and little is less welcome when reversing.

The driver monitoring system is also quite annoying, giving you barely two seconds of grace to look at the massive, complex, rotating circus act of an infotainment system before it starts beeping. Switching that off is notably harder than on other systems, and done via a second separate process. Would it hurt to put a control for it on the same page as the other ADAS functions? It would certainly make the car’s de facto pre-flight checklist shorter and less bothersome.

MPG & RUNNING COSTS

4
BYD Sealion 7 review 2025 001

A usable battery capacity of 82.5kWh isn’t a great deal for an EV of this size and price, in a class where some are closing in on 100kWh, and the Sealion 7 would need to be particularly efficient to fashion competitive range figures from it – which it fails to do.

Our test car recorded touring efficiency of 2.7mpkWh, which most cars of its ilk could trump. That made for a long-distance touring range of only 223 miles (Tesla Model Y Long Range RWD: 252 miles, MG IM6 Long Range: 290 miles, Kia EV6 RWD: 244 miles).

An ‘everyday’ test schedule return of 4.0mpkWh would suggest that the car’s urban efficiency is more competitive. But DC rapid-charging performance is also quite poor, our test car managing a weighted average test result of only 73kW.

VERDICT

6
BYD Sealion 7 review 2025 023

A young car maker growing as quickly as BYD is likely to be guilty of the odd lapse and inconsistency as it finds a path forward. 

It could have done without perpetrating so many conspicuous lapses with what has become one of its flagship models, however. The Sealion 7 ought to show off this company, famed for its expertise in battery and electronics technology, at its very best. But in fact – in entry-level, single-motor form, at least – it’s a pretty lacklustre technical effort, and disappointing for its efficiency and range, and its mediocre ride and handling.

The interior is nearer the mark for material quality and space. The car is strong value, too, and its LFP battery may well reward owners in the longer term.

Broadly, though, BYD could and should try harder to make a statement with its bigger cars in future.

Matt Saunders

Matt Saunders Autocar
Title: Road test editor

As Autocar’s chief car tester and reviewer, it’s Matt’s job to ensure the quality, objectivity, relevance and rigour of the entirety of Autocar’s reviews output, as well contributing a great many detailed road tests, group tests and drive reviews himself.

Matt has been an Autocar staffer since the autumn of 2003, and has been lucky enough to work alongside some of the magazine’s best-known writers and contributors over that time. He served as staff writer, features editor, assistant editor and digital editor, before joining the road test desk in 2011.

Since then he’s driven, measured, lap-timed, figured, and reported on cars as varied as the Bugatti Veyron, Rolls-Royce PhantomTesla RoadsterAriel Hipercar, Tata Nano, McLaren SennaRenault Twizy and Toyota Mirai. Among his wider personal highlights of the job have been covering Sebastien Loeb’s record-breaking run at Pikes Peak in 2013; doing 190mph on derestricted German autobahn in a Brabus Rocket; and driving McLaren’s legendary ‘XP5’ F1 prototype. His own car is a trusty Mazda CX-5.