Electric vehicles represent the future of transportation, but experiencing charging issues can be frustrating. If you've noticed your electric vehicle doesn't reach a full 100% charge, you're not alone. This behaviour is often intentional and beneficial for your vehicle. If your EV isn't reaching a full charge, several factors could be at play. Let's explore the most common causes and solutions.
Common Reasons for Incomplete Charging
Battery Management System Limitations
While many EVs use a Battery Management System (BMS) to optimise longevity, the amount of reserved capacity varies by manufacturer. Some models allow full charging but recommend users stop at 80-90% to reduce degradation, while others, such as Volkswagen ID. models, display the actual full capacity at 100%. Always check your vehicle’s manual for specific charging recommendations.
Battery Degradation
Like all lithium-ion batteries, EV batteries naturally degrade over time, reducing their ability to hold as much energy as when new. A degraded battery may charge more slowly. Factors like frequent fast charging, extreme temperatures, and regularly charging to 100% can accelerate this aging process.
Considering all the factors, the ClearWatt EV Health Test provides real-world range estimates, predicts performance in different conditions, and offers future range projections, helping you make informed decisions to maximise battery life. Even though extreme temperatures and frequent fast charging can accelerate degradation, most EVs remain functional well beyond a decade.
Charging Equipment Issues
Sometimes the issue isn't with your car but with the charging equipment. Home chargers occasionally have compatibility issues with certain EV models, while electric vehicle charging port issues, the same as damaged charging cables, can cause charging to stop prematurely. At public charging stations, communication errors between your car and the charger might prevent a complete charge cycle.
- Faulty home charger.
- Damaged charging cable.
- Dirty charging port connections.
Software Updates and Settings
Your EV's software might be limiting charging:
- Scheduled charging settings.
- Range optimisation settings.
Environmental Factors
Battery chemistry is sensitive to temperature:
- In winter, if the battery is cold EVs charge slower and may appear to lose range.
- Extreme heat can also affect charging performance - energy is used to cool the battery pack during charging in hot climates.
Nurturing Your EV Battery
For daily driving, aim to keep your battery between 20% and 80% charge. Save those 100% charges for when you're preparing for longer journeys. When possible, use standard AC charging rather than DC fast charging for your routine needs, as the slower charging process is gentler on your battery.
Temperature management can be quite influential too. Preconditioning your vehicle while it's still plugged in allows it to reach optimal temperature without drawing energy from the battery and reducing your driving range. During extreme weather, try to park in temperature-controlled or sheltered areas to minimise stress on the battery system.
For the most convenient charging experience, take advantage of scheduled charging features. Setting your car to finish charging shortly before your typical departure time ensures you start with an optimal charge without leaving the battery sitting at its maximum level for extended periods.
When You Should Seek Additional Help
How to fix an EV that won’t charge properly?While most charging limitations are normal and beneficial, some situations warrant closer inspection. Consider seeking help if your driving range decreases significantly beyond the expected 2-3% annual degradation, or if charging takes much longer than when your vehicle was new. Battery fault warnings on your dashboard or consistent charging interruptions before the charge has completed are also good reasons to have your system checked by professionals.
Professional EV Health Testing
If you're concerned about your EV's battery health or charging performance, a professional battery health check can provide peace of mind. To get a comprehensive report about your specific EV, you can download the ClearWatt app and run an EV Health Test for your vehicle. The 3-page comprehensive report includes your vehicle's current real range, future range predictions, charging efficiency, and overall system health; helping you make informed decisions about your electric vehicle's maintenance and potential long-term value.
FAQs About Electric Car Charging Problems
Does an electric car stop charging when full?
Yes. Electric vehicles have sophisticated Battery Management Systems (BMS) that automatically stop charging when the battery reaches its designated maximum charge level. This prevents overcharging and protects battery health. The charge might stop at 100% or at a lower percentage if you've set a charging limit.
Why does my EV only charge to 80%?
This is likely because you or a previous owner set a charge limit in the vehicle settings. Manufacturers often recommend charging to 80% for daily use to extend battery life. Check your vehicle's charging settings to adjust this limit if needed.
Is it bad to charge my electric car to 100%?
Occasional 100% charges aren't harmful, especially before long journeys. However, regularly charging to 100% and keeping the battery at 100% for extended periods can accelerate battery degradation. Most manufacturers recommend daily charging to 80-90% to maximise battery lifespan.
How do I know if my EV battery is degrading?
Signs of battery degradation include reduced range, longer charging times, and the inability to hold a full charge. To get a comprehensive report about your EV’s battery health, you can download the ClearWatt app and run an EV Health Test for your vehicle.
Can extreme temperatures affect EV battery charging speed?
Yes. Both very cold and very hot temperatures can impact charging speed and capacity. Cold temperatures particularly affect charging efficiency, while extreme heat can trigger protective systems that limit charging to prevent overheating.
Does fast charging damage EV batteries?
Occasional fast charging is fine, but frequent use can increase battery temperature and stress, potentially accelerating degradation. For everyday charging, AC charging (Level 1 or 2) is gentler on the battery.
