BYD Sealion 7 Comfort vs Hyundai IONIQ 5 Advance 84: which UK family EV is easier to live with?

The Sealion 7 is a BYD battery-electric family SUV offered in Britain, while the IONIQ 5 is Hyundai's locally listed battery-electric crossover. They are a more coherent same-task shortlist than a smaller petrol hybrid when the family already has a home charger. September 2026 SMMT data record 3,191 Sealion 7 registrations, third among battery-electric models: a model-level purchase signal, not sales of this Comfort trim or a Chinese-only Top 10 table. Our UK Search Console export for 18 September to 15 October records 44 Sealion 7 query/page rows, 422 impressions and no clicks. That is CathayEV's search exposure, not national query volume. A UK Auto Express group test explicitly compares these two models. This makes the topic a B-grade local model-demand plus comparison-result lead; it does not establish any exact-pair search volume or replicate the test's road verdict.

This is the Sealion 7 Comfort rear-drive 82.5-kWh car, not the quicker Design AWD or 91.3-kWh Excellence. Opposite it is Hyundai's model-year-2027 IONIQ 5 Advance 84-kWh 228-PS rear-drive car on 19-inch wheels, not the cheaper 63-kWh Advance. Hyundai's UK October 2026 list effective from 1 October gives £44,195 recommended OTR for this exact 84-kWh trim. A Lookers listing read on 27 October gives £47,025 RRP and £44,620.80 cash for its specified new BYD Comfort, with an offer window from 7 October to 31 December, subject to stock and change. The displayed cash difference is £425.80, but it compares a dealer offer with a manufacturer recommended price. The un-discounted BYD RRP is £2,830 above the Hyundai list figure. Neither comparison is a final same-date drive-away gap: obtain written quotes for colour, accessories, fees, part exchange and delivery. BYD's national finance table still online expired 30 September; its APR and discount are not an October offer.

The BYD Comfort is rated at 300 miles WLTP combined on its 82.5-kWh battery. Hyundai's October MY27 technical sheet rates the exact 84-kWh, 19-inch Advance RWD at 354 miles WLTP combined. That is a 54-mile laboratory advantage for Hyundai, on a comparable UK cycle and the trims named here. It is not a guaranteed 54-mile gap on a wet winter motorway or with a roof box. Hyundai lists 16.04 kWh/100 km combined for this configuration; do not compare that blindly with a differently sourced BYD battery capacity as if it were a measured efficiency test. Before a regular 250-mile journey, plan the usable stop based on your speed, weather, load, elevation and arrival reserve. Ask dealers for the exact wheel and software configuration shown on the order sheet and have both routes tested in the car's planner.

The BYD Comfort UK sheet and dealer listing show a panoramic roof, 360-degree camera, heat pump, adaptive cruise control and a large central screen for the specified vehicle. Hyundai's MY27 table gives the Advance 84-kWh a heat pump, battery preconditioning, dual 12.3-inch screens, front/rear parking sensors and its named driver-assist package; some premium features such as the surround-view system appear higher in the trim table and must not be silently assigned to Advance. Check phone integration, physical controls and driver-assist settings in both order sheets. Euro NCAP's 2025 Sealion 7 five-star assessment explicitly includes right-hand-drive Comfort 4x2. IONIQ 5 has a five-star result published under the 2021 protocol with a facelift review in 2024, but the published variant table names the earlier 160-kW long-range RWD, not the exact MY27 168-kW car. Request the current variant applicability before claiming an equivalent rating for this order. Scores from different protocols cannot rank these cars directly.

BYD's UK policy states six years or 93,750 miles for general vehicle cover and a generic eight years or 125,000 miles for the high-voltage battery. A separate BYD Europe announcement describes a longer 250,000-km battery term, so we will not promise either mileage cap for a particular UK VIN without the current written warranty booklet. Hyundai UK states five years unlimited mileage for the vehicle and eight years or 100,000 miles for the high-voltage battery; its detailed exclusions and capacity threshold still matter. For a high-mileage buyer, the kilometre and mileage limits can alter the apparent year advantage. Ask both retailers to identify the nearest authorised EV repairer, current appointment lead time, courtesy-car policy, roadside assistance and service schedule. A headline warranty is less useful if a needed repair involves a long wait or an uncovered item.

The Lookers £44,620.80 cash figure is for a specified BYD offer; Hyundai's £44,195 is a recommended OTR list figure. Obtain two same-date signed drive-away quotes before claiming one is cheaper to buy. The BYD dealer's illustrated £499 monthly PCP requires a £4,999 customer deposit and £16,924.50 optional final payment after 48 instalments, plus mileage and condition limits; a monthly figure alone hides most of the commitment. A comparable Hyundai PCP for the exact Advance 84-kWh version was not verified here. BYD publishes insurance group 45E for the Comfort, versus 38E in Hyundai's October table for the Advance 84; groups are rating categories, not premiums, so ask insurers to quote your drivers and postcode. For your own running-cost sheet multiply the meter's kWh per charging session by the home or public tariff, add motorway charging surcharges, tyres, insurance quotes, VED by registration date, servicing and depreciation. Hyundai's 54-mile WLTP edge does not itself establish the cheaper cost per mile; real energy consumption, local electricity prices and residual value remain unmeasured. Both cars have zero tailpipe emissions, but that does not mean zero road tax or insurance cost.

Research was checked on 27 October 2026 for the UK. Model heat comes from SMMT September registrations and dated UK Search Console rows; neither measures this exact pair's monthly search volume. The observed local comparative SERP supports the editorial shortlist but is not copied as a verdict. BYD's current individual dealer listing and Hyundai's October MY27 manufacturer sheet establish different price bases, which we label visibly. The range comparison uses two WLTP combined figures for named rear-drive trims; rapid-charge times both use 10-80 percent but assume different compatible high-power posts. No CathayEV road test, owner survey, current insurance quote, household energy tariff or like-for-like dealer transaction was obtained. Recheck trim, warranty, finance and NCAP variant applicability before deposit, and compare your own journey in each car. A production exact and semantic URL check is required before this bundle can be published as a new article.