The Nissan Leaf is the honest cautionary tale of used EVs. It has no active battery cooling, so its pack ages faster than liquid-cooled cars of the same age and mileage, especially if it's been rapid-charged a lot or lived somewhere warm.
That doesn't make a used Leaf a bad buy. It makes state of health the number that matters.
What state of health means on a Leaf
State of health (SOH) is the percentage of original battery capacity the pack still holds. A brand-new 40 kWh Leaf has 100% SOH. After five to six years and 40,000 miles, a typical air-cooled Leaf sits somewhere between 78% and 88% SOH, depending on climate, charging habits, and luck.
On the Leaf's dashboard, SOH shows as capacity bars, twelve when new. Losing a bar usually means the battery has dropped below roughly 85%. Losing two bars (below about 78%) is common on older 24 kWh and 30 kWh models. If the car you're looking at still has 10 or more bars, the battery is in reasonable shape for its age.
How much range does a degraded Leaf actually give you?
A 40 kWh Leaf at 85% SOH has roughly 34 kWh of usable energy left. In mild weather at urban speeds, that's about 120 to 130 miles. In winter with the heater running, expect 85 to 100 miles. On the motorway in winter, it could drop to 70 to 80 miles.
Those numbers are still perfectly usable for a daily commuter, the average UK car journey is under 30 miles. But they're a long way from the 168-mile WLTP figure Nissan quoted when the car was new. Check the real vs WLTP range gap data to see how much the gap varies across models.
What to check before buying a used Leaf
Battery bars: count them on the dashboard. 10+ bars is good. 9 bars is acceptable if the price reflects it. 8 or fewer means significant degradation.
Rapid charging history: frequent DC rapid charging heats an air-cooled pack with no way to cool it down. A Leaf that's been hammered on rapids will have lost more capacity than one charged slowly at home overnight.
Climate: a Leaf that spent its life in Scotland will typically have a healthier battery than one from the south of England, simply because heat accelerates degradation in air-cooled packs.
LeafSpy app: for a more precise reading than the dashboard bars, the LeafSpy app (with a cheap OBD2 Bluetooth dongle) shows exact SOH percentage, individual cell voltages, and temperature history. It costs about £5 and is the single best investment before buying a used Leaf.
Is it still worth buying one?
At £6,000 to £9,000 for a 40 kWh model, a used Leaf is one of the cheapest ways into electric driving. Running costs on an off-peak tariff are roughly 2p per mile. Insurance is cheap. Reliability is excellent, there's very little to go wrong mechanically.
If your daily driving is under 50 miles and you can charge at home, a used Leaf with decent battery health is hard to beat on value. Just don't expect it to do long motorway trips comfortably, that's not what it's for. For longer-range options at similar prices, see the best used EVs under £15,000.
Our model estimates a Leaf's remaining capacity from its age and mileage using a degradation profile calibrated for air-cooled packs, and shows the resulting real range. Open the Leaf 40 kWh page or the Leaf e+ 62 kWh page and set the age and odometer to the car you're looking at.