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By Jonathan Crouch

The BYD Seal U DM-i extends PHEV tech into BYD's range. Jonathan Crouch takes a look.

Ten Second Reviewword count: 66

The Seal U DM-i is BYD's first attempt at a Hybrid, a PHEV that aims to broaden the brand's sales base beyond EVs. It's possibly not the most exciting or engaging segment choice you could make, but value and practicality are both strong points that make this a family car worthy of consideration if you're looking at electrification but aren't quite ready for an electric vehicle.

Backgroundword count: 182

Just when we got used to the idea of Chinese maker BYD being an all-electric brand, along comes this car, the Seal U DM-i - a Plug-in Hybrid. You'd have thought the opposite approach - PHEV first, then EVs (as rival Polestar did) would make more sense. But BYD has its own way of doing things - as the unusual design of its first three EV models has shown. One of these was also badged 'Seal', a mid-sized EV saloon with premium aspirations that we really liked. We're not sure why the Plug-in Hybrid model we look at here also has a 'Seal' moniker because it shares virtually nothing with its EV showroom stablemate in terms of looks, price, powertrain or market positioning - the U DM-i is a five-door mid-sized SUV. The Seal U can also be had as an EV in other markets, but here to start with, we only get the DM-i PHEV version, the 'DM' letters standing for 'Dual Mode', BYD-speak for designation of the fact that an engine assists the electric drivetrain. Let's take a closer look.

Engines and Tech Specword count: 327

It's a little-known fact that BYD was the first manufacturer to mass-produce a PHEV - a model called the F3DM back in 2008 that hardly anyone bought. But the Chinese learn quickly and BYD can justifiably claim cutting-edge Plug-in Hybrid technology with this Seal U DM-i. The mid-range front-driven 'Comfort'-spec version can claim an EV range of up to 78 miles from its 26.6kWh battery before a frugal normally aspirated 1.5-litre petrol engine cuts in as you cruise past the queues at your local charging station. Still want that EV? This is one of three very different versions of the DM-i powertrain. There's an entry-level model badged 'Boost' (confusingly because its four cylinder engine is also normally aspirated). This variant uses the same 215bhp Atkinson cycle unit as the 'Comfort' model, aided by a single e-motor on the front axle and tuned for economy at low speeds. 'Boost'-spec though, mates this unit with a smaller 18.3kWh battery pack, with a still-reasonable EV range of 50 miles. The other Seal U DM-i model is the top 'Design'-spec version, tuned very much for performance. Here, the 1.5-litre engine gets a turbocharger and switches to the Miller cycle aimed at high speed frugality. Plus an extra e-motor is added to the rear axle to create AWD. Power jumps to 319bhp, improving the 8.9s 0-62mph sprint time you get with the front-driven models to just 5.9s. The 'Design' version supplements the usual 'Eco', 'Normal' and 'Sport' drive modes with extra 'Mud' and 'Sand' settings too. The battery on offer is the smaller 18.3kWh one and is supposed to deliver up to 43 miles of EV range. Expect the drive experience to be very EV-like - the complicated powertrain ensures that there's always a minimum battery charge of at least 25%. But don't expect the engaging driving dynamics we enjoyed with the Seal EV saloon. Seal U has a soft ride and light steering, but compensates with effective brakes and outstanding refinement.

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