The 80% charging rule for EVs is simple: for everyday driving, set your car to stop charging at around 80% rather than 100%. You spend less time at rapid chargers, and most batteries wear more slowly. In 2026, though, the rule doesn't fit every car. Using over 25 years of leasing experience at First Vehicle Leasing, this guide shows you how to apply it to yours.
Key Takeaways
- For most EVs with nickel-based (NMC) batteries, the standard advice is to set an 80% daily limit and charge to 100% only before long trips.
- Rapid charging slows down sharply above 80%. Hyundai quotes around 18 minutes for a 10–80% charge on a 350kW charger for the Ioniq 5 Long Range.
- Lithium iron phosphate (LFP) batteries cope much better with full charges. Tesla tells owners of LFP cars to charge to 100% at least once a week.
- Batteries typically lose around 2.3% of their capacity a year, and on a lease, the funder owns the car and carries the residual value risk, so long-term battery health is mainly their concern rather than yours.
- Electric company cars are taxed at a 4% Benefit in Kind (BIK) rate in 2026/27, rising to 5% in 2027/28.
What Is the 80% Charging Rule for EVs?
The 80% rule means setting your electric car to stop charging at about 80% state of charge (SoC), which is how full the battery is as a percentage. You only go to 100% when you actually need the range. There are two benefits: shorter stops at rapid chargers and less long-term strain on most lithium-ion batteries.
Why does it help? When a lithium-ion battery is close to full, its voltage is high, and high voltage speeds up the chemical side reactions that permanently reduce capacity. Many drivers also avoid dropping below 20%, which is why you'll often hear it called the 20–80 rule.
For most people, 80% is plenty. If your car manages 250 miles in real-world driving on a full battery, 80% still gives you around 200 miles. That covers a week of typical commuting for many drivers.
Why Does EV Charging Slow Down After 80%?
As the battery fills, the car's battery management system (BMS) cuts the charging power to limit heat and voltage stress. The BMS is the software that protects the cells. On a rapid charger, that means the last 20% can take almost as long as everything before it, so stopping at 80% usually gets you back on the road sooner.
The Hyundai Ioniq 5 is a good example. Hyundai quotes around 18 minutes for a 10–80% charge on a 350kW DC (direct current, or rapid) charger with the 84kWh Long Range battery, and 76 minutes on a 50kW unit. An often-quoted test of the Long Range model needed a further 32 minutes to get from 80% to 100%. That's nearly twice the time it took to go from 10% to 80%.
Here's an illustrative road trip. Say your car does 300 miles on a full charge. At 80% you still have about 240 miles. Rather than wait for the slow final 20%, unplug and drive on to the next charger. In the time you'd have spent topping up, you could be well down the motorway.
Does the 80% Rule Apply to Every EV Battery?
No. The rule matters most for nickel-based batteries (NMC, short for nickel manganese cobalt), which most long-range EVs use. Lithium iron phosphate (LFP) batteries cope much better with a full charge. Some manufacturers actually recommend charging LFP cars to 100% regularly so the range estimate stays accurate.
Tesla's owner's manual tells owners of LFP cars to keep the charge limit at 100% and to charge fully at least once a week. That's because an LFP battery's voltage stays almost flat for most of the charge, so the BMS needs a full charge from time to time to work out how much energy is really left. BYD uses its LFP Blade battery across its European range, including the BYD Dolphin. BYD doesn't publish the same instruction, though, so follow your handbook rather than borrowing Tesla's advice.
| Feature | NMC (nickel-based) | LFP (lithium iron phosphate) |
|---|---|---|
| Typically found in | Most long-range and performance EVs | BYD models and many standard-range versions |
| Everyday charge limit | Around 80% (some brands suggest 90%) | Up to 100% if the handbook says so |
| Charging to 100% | Occasionally, before long trips | Regularly, often weekly |
| Main concern | Sitting at high charge, especially in heat | Range estimate drifting without full charges |
How do I know which battery my car has?
Check the handbook, the spec sheet or the manufacturer's website. On a Tesla, go to Controls, then Software, then Additional Vehicle Information. Battery type can vary between trims and model years. The Volvo EX30, for example, has used LFP in its Standard Range versions and NMC in its Extended Range versions. If you're still not sure, ask our team before you order.
When Should You Charge Your EV to 100%?
Charge to 100% whenever you need the extra range: long journeys where chargers are few and far between, cold winter trips, towing, or if your handbook recommends regular full charges for an LFP battery. Timing is what matters. Aim to finish charging shortly before you set off rather than leaving the car sitting full for days.
- Long motorway trips or rural routes where rapid chargers are sparse
- Cold weather, which temporarily cuts range
- Towing or carrying heavy loads
- LFP cars, where the manufacturer asks for regular full charges
So is charging to 100% actually bad for the battery? Doing it now and then, no. The real enemy is a hot battery kept full for a long time. Leaving a car at 100% for a fortnight is far worse than hitting 100% at 7am and driving off at 7.15. Manufacturer advice varies, with some suggesting 80% and others 90% for daily use, so your handbook has the final say.
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Check my eligibilityHow Do You Set an 80% Charge Limit?
Most modern EVs let you set a maximum charge level on the touchscreen or in the manufacturer's app, and many smart home chargers can do it too. Set 80% once (or 100% for an LFP car if the handbook says so), schedule charging for your off-peak tariff, and raise the limit the night before a long trip.
- Find the charge limit setting in the car's charging menu or app.
- Set your daily limit to suit your battery type.
- Schedule charging overnight to use cheaper off-peak electricity.
- Before a long journey, raise the limit and time the charge to finish close to when you leave.
- Switch back to your daily limit afterwards. This is the step people most often forget.
For more on home, workplace and public charging, see our guide on how to charge your electric car.
Does Battery Health Matter When You Lease an EV?
Much less than if you buy. Most EV batteries are warranted for eight years or 100,000 miles to at least 70% state of health, and typical capacity loss is around 2.3% a year. The BVRLA's fair wear and tear guidance covers wear from normal use in general terms, but it doesn't specifically classify battery degradation, and its EV return guidance focuses instead on practical points such as having the car fully charged at collection. Either way, the funder owns the car and carries the residual value risk, so long-term battery health is mainly their concern rather than yours.
On a three-year lease, 2.3% a year works out at roughly 7% in total, so you'd expect to hand the car back with about 93% of its original capacity. Our EV battery degradation guide goes into more detail. It's still worth following the 80% rule, because it keeps your range consistent for the whole contract.
What EV drivers actually get charged for at the end of a lease is more mundane: missing or damaged charging cables. The BVRLA's guide to returning your leased vehicle explains how the handback inspection works.
How Much Tax Do You Pay on an Electric Company Car in 2026/27?
HMRC's published company car rates put fully electric cars on a Benefit in Kind (BIK) rate of 4% for the 2026/27 tax year. That rises to 5% in 2027/28, 7% in 2028/29 and 9% in 2029/30. Petrol and diesel cars sit at roughly 15–37% of list price, depending on their CO2 emissions.
Example: a £40,000 EV at 4% BIK gives a taxable benefit of £1,600 a year. That's £320 a year in tax for a basic-rate (20%) taxpayer, or £640 for a higher-rate (40%) taxpayer. You can check the current bands in HMRC's appropriate percentage tables and the government's policy paper on rates for 2028 to 2030. Electric cars have also paid Vehicle Excise Duty since April 2025, collected by the DVLA. If your employer offers it, salary sacrifice can make an EV cheaper again, because the lease is paid from your salary before tax and National Insurance.
What Charging Routine Should You Follow?
Start with your battery type, then fit your routine around how you drive. NMC cars should sit at an 80% daily limit, while LFP cars should follow the manufacturer's full-charge advice. Whatever the chemistry, avoid leaving the car full or nearly empty for long periods, and charge higher only when a trip calls for it.
You have an NMC battery
Set an 80% daily limit, keep above 20% where you can, and charge to 100% only before long trips. Most long-range cars, such as the Ioniq 5, fit here.
You have an LFP battery
Follow the handbook. If it says charge to 100% regularly, do it, because the car's range estimate depends on it. Check battery type on standard-range cars such as the Tesla Model 3.
You're setting off on a long trip
Charge to 100% at home just before you leave, then stop at around 80% on rapid chargers along the way.
You're parking up for a week or more
Leave the battery between 20% and 80%, and never park it full or near empty for long spells.
Ready to Lease an Electric Car?
First Vehicle Leasing is authorised and regulated by the FCA and is a BVRLA member. Our team can tell you which battery a car uses, what the manufacturer recommends and which current deals offer the best value. Call us on 0333 003 3325 or browse online.
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Sources
Written by Andy Bell, First Vehicle Leasing.
