<img src=https://nenpower.com/wp-content/uploads/2025/04/image-10994.webp alt=’What are the signs that a PHEV’s battery needs replacement’ />
- Decreased Fuel Economy
As the battery degrades, it holds and releases less energy efficiently, causing the gasoline engine to work harder and consume more fuel. A noticeable drop in miles per gallon (MPG) without other causes is a key sign of battery decline. - Dashboard Warning Lights
Warning indicators such as the battery symbol, check engine light, or a hybrid system warning light can signal battery problems. These lights often point directly to the high-voltage battery or related system issues. Diagnostic tools or professional inspection can clarify the cause. - Fluctuations or Failure to Hold a Charge
Erratic battery charge levels displayed on the dashboard, or inability to maintain charge overnight (e.g., you charge the car fully but find the battery low soon after) indicate battery cell degradation or imbalance. - Reduced Electric Range and Performance
A PHEV battery losing capacity will result in shorter electric-only driving ranges and may cause sluggishness or inconsistent power delivery. This can also manifest as the internal combustion engine running more frequently or for longer periods than usual. - Charging Issues
The battery may charge more slowly than normal or fail to reach full charge, reflecting internal damage or cell imbalance. - Unusual Noises or Physical Battery Damage
Although less common, abnormal noises or signs of physical battery damage such as swelling or bloating of the battery case are serious indications that require immediate attention.
In summary, the primary signs that a PHEV battery needs replacement include diminishing fuel economy, warning lights on the dashboard, inability to hold or maintain charge, decreased electric driving range, charging difficulties, and any unusual physical battery symptoms. Monitoring these indicators can help avoid unexpected breakdowns and costly repairs.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/what-are-the-signs-that-a-phevs-battery-needs-replacement/
