Estimated realistic range of the BYD Sealion 7 RWD Comfort over ten years at typical UK mileage, against the usual 70% capacity warranty floor.
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What degradation looks like on a BYD Sealion 7 RWD Comfort
From a realistic 255 miles when new, a typical BYD Sealion 7 RWD Comfort still manages about 230 miles at 5 years (90% health), 216 miles at 8 years (85%) and 207 miles at 10 years (81%).
The first year usually shows the biggest single drop as the pack settles, after which the fade slows to a crawl. Batteries almost never fail outright; they just gradually carry a little less.
Most manufacturers warrant the battery for 8 years or 100,000 miles against falling below about 70% capacity. On this car, 70% health still means around 180 miles of realistic range.
Habits that keep the battery healthy
- Charge to 80% for daily use and save 100% for long trips
- Avoid leaving the car parked for weeks at 100% or near empty
- Use AC charging for routine and rapid charging for journeys
- Do not fear normal use: the management system protects the pack far better than folklore suggests
If you are looking at a used BYD Sealion 7 RWD Comfort, an EV specialist can read the exact state of health from the battery management system. It is the single most valuable check on a used electric car, and it turns this page's estimate into a measured fact.
Cables and kit for the BYD Sealion 7 RWD Comfort
The BYD Sealion 7 RWD Comfort supports V2L, so its battery can run 230V appliances on the drive, at a campsite or in a power cut. Our V2L cable for BYD cars gives you a mains socket from the charge port, on a lead up to 15m.
A spare Type 2 cable for public posts, or a granny charger for the boot, is in our EV charging cables and chargers range, built to order in the UK by Wottz.
Related on The EV Pros
BYD Sealion 7 RWD Comfort servicing near you
Every business on The EV Pros is checked for EV competence, so your BYD is worked on by people trained for high voltage systems.
Buying a used BYD Sealion 7 RWD Comfort?
Run its reg through our free car check first: every MOT, the mileage at each one, and what to expect from the battery at its age. The full history check adds outstanding finance, write-off and stolen records.