Battery health is the share of the original usable capacity a battery still has. Read it beside mileage, age and the remaining factory battery warranty, not on its own.
What battery health means
Battery health, sometimes called state of health, is the usable capacity a battery has today as a percentage of its capacity when new. A Model 3 at 90% battery health can store about nine tenths of the energy it could when it left the factory, so its full-charge range is roughly nine tenths of the original range in the same conditions.
How much capacity a used Tesla usually loses
Most lithium-ion EV batteries lose capacity fastest in the first years and then level off. Age, total kilometres, how often the car was fast charged and how often it sat at a very high or very low charge all play a part. Two cars of the same year can differ by several points, which is why the reading for the specific car matters more than an average.
How to read a battery health estimate
UC Auto lists battery health on EV pages as an estimate with a margin of error, for example "Est. 91% (±2.5%)". Compare it with the car's age and mileage: a high-mileage car with a strong reading has aged well, while a low-mileage car with a weak reading deserves questions. When no reading is listed, ask our team before you visit.
Check the remaining factory battery warranty
Tesla's battery and drive unit warranty for Model 3 and Model Y runs for 8 years. The kilometre limit is 160,000 km for Rear-Wheel Drive and Standard Range versions and 192,000 km for Long Range and Performance versions, whichever comes first, with at least 70% capacity retained during the warranty period. The warranty follows the car to the next owner. UC Auto EV pages show the warranty end date and kilometre limit when they are confirmed.
What to check in person
Look at the range shown at a known charge level, ask how the car was charged, check that both the charge port and the charging cable work, and drive the car long enough to see how the estimated range behaves. Cold weather in the Lower Mainland lowers winter range for every EV; that is normal and is not battery damage.
Common questions
What is a good battery health for a used Tesla?
It depends on age and kilometres. Many Model 3 and Model Y cars a few years old read in the high 80s to low 90s percent. Compare the reading with the car's mileage and the remaining factory battery warranty rather than using one number as a cut-off.
Does the Tesla battery warranty transfer to a used car buyer in Canada?
Yes. The 8-year battery and drive unit warranty stays with the vehicle, so a used buyer keeps whatever time and kilometres remain.
Where can I see battery health on UC Auto's EVs?
Each EV page on ucauto.ca has an EV condition section with the battery health estimate and the factory battery warranty end date when available. If a reading is not listed, call or text 236-886-5888 and we will check.