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How to check a used Nissan Leaf battery before you buy (UK)
Published · Last updated · based on 12 sourced Leaf data points
The Leaf was the UK's second most popular used EV in 2025 (Electrifying.com), and it's often the cheapest way into an electric car. Its battery has no active cooling, so two Leafs of the same age can be in very different shape. This guide covers what the capacity bars really tell you, how to read LeafSpy's SOH and Hx, the differences between the 24, 30, 40 and 62 kWh cars, and how to judge the result.
All Leaf figures with method and date: used Nissan Leaf battery data. Going to a viewing? Make a printable list of questions for the seller.
1. Find out which battery it has
| Battery | Generation | What the sources say |
|---|---|---|
| 24 kWh | First generation (2011 on) | Recurrent (US) says these original packs are the most degraded today, and that the revised "lizard" battery from the 2015 model year tolerates heat better (Recurrent). Nissan UK's guarantee for 24 kWh cars was 5 years / 60,000 miles (Nissan Motor). |
| 30 kWh | First generation (2016–2017 model years in the US) | Recurrent says the 30 kWh pack "is also known for degradation" (Recurrent). Nissan UK's Customer Promise gave it 8 years / 100,000 miles below 9 bars (Nissan Motor). |
| 40 kWh | Second generation ("ZE1", from 2018) | 192 cells (Nissan UK newsroom). Most of the independent test data below is for this pack. |
| 62 kWh (e+) | Second generation, from 2019 | 288 cells in a pack almost the same size as the 40 kWh one (Nissan UK newsroom). No active cooling either (DTU – Technical University of Denmark). |
Model years are as published by Recurrent for US cars; UK registration dates can differ. Check the battery size on the V5C, the advert's spec or the car's documents.
2. Count the capacity bars – and know their limits
The Leaf has a battery capacity level gauge, separate from the charge gauge. Nissan's manual says it shows how much charge the battery is capable of storing and goes down as capacity falls with age and use. On the second-generation car it is one of the trip-computer screens (Nissan UK). Twelve bars means new.
- The first bar takes a lot of loss to disappear. LeafSpy's documentation says the first capacity bar goes once the SOH has stayed around 85% for a few weeks (LeafSpy). So a car showing 12 bars can be anywhere between as new and about 85%.
- Later bars come faster. Figures quoted from an April 2011 Nissan service manual put the loss of bars 2, 3 and 4 at 78.75%, 72.5% and 66.25% capacity (InsideEVs, 2016-01-06). They come from early-car documentation, and we couldn't confirm that they still apply to the 40 and 62 kWh cars.
- The warranty is defined in bars. Nissan's battery guarantee covers capacity loss below 9 of 12 bars on the gauge, not a percentage (Nissan UK).
Bars are a coarse measure. For a buying decision you want a number, from LeafSpy or an independent test.
3. Read LeafSpy: SOH, Hx and the rest
LeafSpy is a phone app that reads the Leaf's battery management system. It needs an OBD-II adapter (Bluetooth or Wi-Fi) plugged into the socket under the dashboard, and the car must be switched on, not just in accessory mode (LeafSpy). Its battery screen shows:
| Reading | What it means (LeafSpy documentation) | How to use it when buying |
|---|---|---|
| SOH | State of health: the battery's ability to hold and release energy, as a percentage. 100% when new. | The main figure. Compare it with the data in section 6. |
| AHr | The battery management system's rating of present capacity – "the size of the tank", not how full it is. Declines with age. | Falls along with SOH; useful to compare two cars with the same pack. |
| Hx | "The meaning of this number is not fully understood." It appears to be inversely related to internal resistance; 100 would be factory new. | A secondary indicator only. Don't let a seller use a high Hx to explain away a low SOH. |
| QCs, L1/L2 | Number of quick (rapid) charges, and number of AC charge-cable connections. | Gives you an idea of how the car was charged. |
| Cell-pair voltages | Voltage of each of the 96 cell pairs and the mV difference between highest and lowest: "the lower this number the better balanced is the pack". | A large difference is worth asking about. In UK tests across all EVs, about 1 in 85 cars showed an imbalance above 50 mV (Generational). |
Definitions from LeafSpy.
One reading is a snapshot. In a Technical University of Denmark study of one 62 kWh Leaf logged twice a day for 18 months, the SOH figure moved in steps roughly every 90 days – up at 6 and 9 months, down at 12 and 15 months – which the authors put down to periodic updates of the car's capacity estimate. It also fell faster in warmer months (DTU – Technical University of Denmark). Ask for a recent, dated screenshot that shows the odometer, or connect LeafSpy yourself at the viewing.
4. Get an independent test if you can
LeafSpy shows the car's own estimate. An independent test such as AVILOO works out SoH with its own algorithms rather than copying the car's reading (AVILOO GmbH). The second-generation Leaf is one of the most-tested models in AVILOO's 2026 report (n=9,222; AVILOO GmbH). Test prices are on our buying guide, and our guide to reading a battery health certificate explains each field on the report.
5. Ask how it was charged and driven: heat is the Leaf's weak spot
The Leaf has no active cooling system, so the pack loses heat only through its casing (DTU – Technical University of Denmark). Recurrent describes every first- and second-generation Leaf as having a passively air-cooled battery with no liquid thermal management, which makes heat-driven degradation a central buying point (Recurrent). Nissan's own manual says the battery temperature is more likely to rise when driving at high speed continuously, climbing hills continuously, after repeated quick charging, or in hot weather. When it is too hot, power can be limited, and quick charging can take longer (Nissan UK).
- Ask how often the car was rapid-charged, especially back to back on long trips. The LeafSpy QC count is a useful cross-check.
- Recurrent notes that the 40 and 62 kWh cars throttle rapid-charging speed after repeated back-to-back rapid charges (Recurrent). Bear that in mind if you plan long trips.
- A car that spent years in a hot climate is a bigger risk. In Bjørn Nyland's measured-capacity tests, a 2011 Leaf 24 kWh (used in California) had 45.7% at 108,000 km (single car, Bjørn Nyland / TB Test Results).
6. Compare the result with what's normal
| Group | Mileage | SoH | Sample | Source (date) |
|---|---|---|---|---|
| Leaf ZE1 (2018+, 40/62 kWh grouped) | 50,000 km ≈ 31,069 mi | 91.2% 99% of cars: 85.4%–95.4% | n=9,222 median | AVILOO GmbH (2026-09-03) |
| Leaf ZE1 (2018+, 40/62 kWh grouped) | 100,000 km ≈ 62,137 mi | 88.3% 99% of cars: 80.9%–93.8% | n=9,222 median | AVILOO GmbH (2026-09-03) |
| Leaf ZE1 (2018+, 40/62 kWh grouped) | 150,000 km ≈ 93,206 mi | 86.7% 99% of cars: 77.8%–93.1% | n=9,222 median | AVILOO GmbH (2026-09-03) |
| Leaf ZE1 40 kWh | 50,000 km ≈ 31,069 mi | 90.8% | multi-car median, 40 kWh only | AVILOO GmbH (2026-09-03) |
| Leaf ZE1 40 kWh | 100,000 km ≈ 62,137 mi | 87.6% | multi-car median, 40 kWh only | AVILOO GmbH (2026-09-03) |
| Leaf ZE1 40 kWh | 150,000 km ≈ 93,206 mi | 85.9% | multi-car median, 40 kWh only | AVILOO GmbH (2026-09-03) |
| Leaf ZE1 40 kWh | avg 73,610 km ≈ 45,739 mi | 90.6% | n=183 average; 61.2% of tested cars above 90% SoH | Ny Teknik / Riddermarks Bil (2026-06-18) |
| 2012 Leaf 24 kWh | 101,000 km ≈ 62,758 mi | 76.2% | n=1 | Bjørn Nyland / TB Test Results (rows dated 2019-01-15 to 2026-10-14 (each row has its own test date)) Single car (n=1), Bjørn Nyland test 2021-03-07: 16 kWh usable vs 21 kWh new. First-generation 24 kWh pack. |
| 2011 Leaf 24 kWh (used in California) | 108,000 km ≈ 67,108 mi | 45.7% | n=1 | Bjørn Nyland / TB Test Results (rows dated 2019-01-15 to 2026-10-14 (each row has its own test date)) Single car (n=1), Bjørn Nyland test 2019-01-15: 9.6 kWh usable vs 21 kWh new. First-generation pack, hot-climate history. |
| Leaf ZE1 40 kWh | 126,131 km ≈ 78,374 mi | 82.0% | n=1 | EVX / Flooratto Kft. (2026-10-01) Single car, n=1. Hungary, tested 2026 (pre-purchase inspection). |
| All US versions grouped | after 3 years | 93% of range | multi-car range kept, not SoH (US) | Recurrent (current page) |
| All US versions grouped | after 5 years | 91% of range | multi-car range kept, not SoH (US) | Recurrent (current page) |
AVILOO and Riddermarks figures are AVILOO tests of second-generation (ZE1) Leafs; Riddermarks reports the average mileage of the tested Swedish dealer cars. Single cars (n=1) are examples, not averages. Recurrent figures measure range, not capacity, across all US Leaf generations. Every row is also on the Leaf data page.
- As a general rule of thumb for all EVs, ADAC expects at least 92% at 50,000 km, 88% at 100,000 km, 84% at 150,000 km, 80% at 200,000 km (ADAC).
- For a quick estimate at a given mileage, use the battery health estimator.
7. Check the battery warranty that's left
Nissan UK: lithium-ion battery state-of-health guarantee covers capacity loss below 9 of 12 bars on the in-car capacity gauge. Pre-MY22 Leaf: 5 years / 60,000 miles. MY22-on Leaf: 8 years / 100,000 miles (whichever comes first). For Leaf Flex (battery lease) customers it applies for the lease duration. (Nissan UK, checked 2026-10-22)
Pre-MY22 Leaf: two published terms. Nissan's current UK page states 5 years / 60,000 miles; older Nissan documents state 8 years / 100,000 miles. Which applies depends on the car's build/registration – confirm with Nissan using the VIN. The older documents: Nissan UK's Customer Promise terms (2019) give 30 kWh Leafs 8 years / 100,000 miles below 9 bars (and 24 kWh Leafs 5 years / 60,000 miles), and Nissan's 2019 LEAF 3.ZERO announcement says the 40 and 62 kWh batteries came with "the same eight-year/100,000 mile Nissan warranty". (Nissan UK, Nissan Motor, Nissan UK newsroom; checked 2026-10-22)
Older Leafs: check the booklet. Ask the seller for the warranty booklet that came with the car, and confirm the cover for that VIN with Nissan.
Our battery warranty checker works out the time and mileage left (Pre-MY22 Leaf: 5 years / 60,000 miles on Nissan's current UK page and 8 years / 100,000 miles in older Nissan documents – it shows both; MY22-on Leaf: 8 years / 100,000 miles). If the battery is leased under Leaf Flex, the guarantee runs for the lease (Nissan UK).
Also see: general used-EV battery checklist · questions to ask a Leaf seller (printable) · all models compared.
Sources used on this page
17 sources · 12 data points: 4 from non-AVILOO methods, 8 measured with AVILOO tests.
- Large test datasets (4 sources, 7 data points): AVILOO GmbH, [2], Ny Teknik / Riddermarks Bil, Generational
- Connected-car / telematics (1 source, 2 data points): Recurrent
- Academic research (1 source): DTU – Technical University of Denmark
- Single-car tests (2 sources, 3 data points): Bjørn Nyland / TB Test Results, EVX / Flooratto Kft.
- Manufacturer (4 sources): Nissan UK newsroom, Nissan UK, [2], Nissan Motor
- Other (specs, guides, news, surveys) (5 sources): Electrifying.com, LeafSpy, InsideEVs, ADAC, AVILOO GmbH
Owner-reported and listing values are single cars (n=1) read from the car, an app or an OBD tool – useful examples, not averages. Range-retention figures (Recurrent) measure range, not capacity. Full details: methodology & all sources.
We are not paid by any of the providers mentioned on this page (see disclosure).
Get this specific car tested
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Model averages can't tell you about the car in front of you. An independent battery test (typically a short OBD plug-in test, some remote) gives an SoH figure and often a certificate you can use when negotiating.
- AVILOO – Independent OBD-based battery test (FLASH / Premium) with certificate; available via partners in the UK and EU.
- Generational – UK OBD plug-in test with certificate (SoH, range, remaining warranty, cell balance); sold through dealers and independent mobile testers.
- Moba – Postal OBD kit: you run the test yourself and post the box back for a digital battery certificate (Europe – check vehicle support and delivery country).
Prices change – check the provider's site. Provider names are used for identification only.
FAQ
How many capacity bars should a used Nissan Leaf have?
Twelve bars means the battery is still above the point where the first bar drops. LeafSpy’s documentation says the first bar is lost once the car’s state of health (SOH) has stayed around 85% for a few weeks, so a 12-bar car can be anywhere from as new down to about 85%. Nissan’s battery guarantee covers capacity loss below 9 of 12 bars within the time and mileage limits.
What is the difference between SOH and Hx in LeafSpy?
SOH is the battery management system’s estimate of how much energy the battery can still hold, as a percentage of new. Hx is a separate figure whose meaning, according to the LeafSpy documentation, is not fully understood; it appears to be inversely related to the battery’s internal resistance, with 100 meaning factory-new. Use SOH for capacity and treat Hx as a secondary indicator.
Does the Nissan Leaf battery have active cooling?
No. Researchers at the Technical University of Denmark note that the Leaf has no active cooling system, so the pack sheds heat through its casing. Nissan’s owner’s manual says the battery temperature is more likely to rise after repeated quick charging, continuous high-speed driving or in hot weather.
What is the Nissan Leaf battery warranty in the UK?
Nissan UK: lithium-ion battery state-of-health guarantee covers capacity loss below 9 of 12 bars on the in-car capacity gauge. Pre-MY22 Leaf: 5 years / 60,000 miles. MY22-on Leaf: 8 years / 100,000 miles (whichever comes first). For Leaf Flex (battery lease) customers it applies for the lease duration. Nissan's current UK page states 5 years / 60,000 miles; older Nissan documents state 8 years / 100,000 miles. Which applies depends on the car's build/registration – confirm with Nissan using the VIN. The older documents: Nissan UK's Customer Promise terms (2019) give 30 kWh Leafs 8 years / 100,000 miles below 9 bars (and 24 kWh Leafs 5 years / 60,000 miles), and Nissan's 2019 LEAF 3.ZERO announcement says the 40 and 62 kWh batteries came with "the same eight-year/100,000 mile Nissan warranty". Ask the seller for the warranty booklet too.
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