BYD Dolphin Battery Health & Range: Used Buyer’s Guide

Quick answer

A used BYD Dolphin (2023-present (UK)) typically has usable ~45 kwh (active/boost) and ~60 kwh (comfort/design), a blade lfp pack, a WLTP range of around 211-265 miles depending on battery when new, and a battery warranty of around 8 years / 125,000 miles to 70% capacity. The value of any individual car comes down to its battery health, check the real-world range now versus when new before you buy.

BYD Dolphin at a glance

Body type	Supermini / small hatchback
Years	2023-present (UK)
Battery (usable)	Usable ~45 kWh (Active/Boost) and ~60 kWh (Comfort/Design), a Blade LFP pack
WLTP range (new)	Around 211-265 miles depending on battery
Real-world range	Roughly 150-220 miles in real use, less in winter
Battery warranty	Around 8 years / 125,000 miles to 70% capacity
Battery cooling	Liquid-cooled LFP (Blade) battery

Figures are typical across the model's life and vary by year and trim, treat them as a guide, not a guarantee for a specific car.

How the Dolphin's battery ages

Battery cooling is a big part of the story: this car uses liquid-cooled lfp (blade) battery. Cars that have spent their life on rapid chargers, been left sitting at 100%, or lived somewhere hot tend to lose capacity faster, which is why two identical Dolphins on the same mileage can be worth different amounts. Read more in our guide to what's normal for EV battery degradation.

What to watch out for on a used BYD Dolphin

Entry Active/Boost (~45 kWh) vs Comfort/Design (~60 kWh) changes range and charging speed
LFP battery, so charging to 100% regularly is fine
New brand in the UK, so check dealer support and remaining warranty
Entry cars charge more slowly on a rapid, factor that into longer trips

What the Used EV Check shows for a BYD Dolphin

Enter the registration and the Used EV Check returns, for that specific Dolphin: its expected real-world range now versus when new, an estimated degradation figure, a battery-health grade where a manufacturer test record exists, and the battery warranty remaining in miles and months. It also pulls the full MOT and mileage history so you can spot clocking or a car that has covered far more motorway miles than the advert suggests.

It's the fastest way to tell a good BYD Dolphin from a tired one before you drive out to view it. For the wider process, see our complete used-EV buyer's guide and how to check an EV's battery health.

Range and battery-health figures are estimates modelled from real-world data and are shown for the specific vehicle in the Used EV Check. Range data is powered by ClearWatt. A battery-health grade is shown where a manufacturer test record exists, it is a comparative grade, not a measured state-of-health percentage.

Range data powered by ClearWatt

Check a used BYD Dolphin before you buy

Enter a registration to see this Dolphin's battery health, real-world range now vs when new and remaining battery warranty, an instant report.

See the Used EV Check (£9.99) →Try the free EV check

Used BYD Dolphin FAQ

How do I check a used BYD Dolphin's battery health?+

You can't see battery state of health on the V5C, the MOT or the advert, and DVLA doesn't publish it. Enter the registration into the Used EV Check and it returns this BYD Dolphin's estimated real-world range now versus when new, its degradation estimate, a battery-health grade where a manufacturer test record exists, and the remaining battery warranty. Range data is powered by ClearWatt.

How much battery degradation is normal on a used BYD Dolphin?+

Like the rest of the range the Dolphin uses BYD’s durable LFP Blade battery, which tolerates daily 100% charging and should lose capacity slowly. Which battery a used car has matters most: the entry Active and Boost use a smaller pack with less range and slower charging than the Comfort and Design. As a rule of thumb, most EV batteries lose the first few percent early on and then settle to a slow decline, so a used Dolphin that still returns close to its original range for its age and mileage is a good sign. The Used EV Check estimates this specific car's degradation for you.

What battery warranty does the BYD Dolphin have?+

BYD Dolphin battery warranty is typically Around 8 years / 125,000 miles to 70% capacity. It covers the battery falling below a set capacity within that time or mileage, and it usually transfers to you as the next owner. The Used EV Check shows how much of the warranty is left in miles and months.

What is the real-world range of a used BYD Dolphin?+

Around 211-265 miles depending on battery is the WLTP figure when new. In real use expect roughly 150-220 miles in real use, less in winter, and less again in cold weather or at motorway speeds. What matters on a used car is the expected range now, which the Used EV Check estimates for the specific vehicle rather than quoting the brochure.

Which BYD Dolphin battery should I choose on a used one?+

The entry Active and Boost trims use a smaller battery of around 45 kWh usable with less range and slower rapid charging, while the Comfort and Design use a larger pack of around 60 kWh. If you mostly do short local trips the smaller battery is fine; for longer or motorway journeys the bigger one is worth seeking out. A used EV check estimates the specific car’s real-world range now.