Reasons for Reduced Driving Range After Fully Charging a Lithium-Ion Battery and How to Address Them

1. Decreased Battery Lifespan

▶ Cause:
Lithium-ion batteries degrade over time with use.
The internal cells gradually lose capacity, resulting in reduced usable capacity even after a full charge.
This is due to chemical reactions inside the battery or cell imbalance that lowers capacity.

▶ Solution:
Replacing the battery is the most definitive solution.
If possible, check the battery’s capacity to see if it has significantly decreased.

2. Battery Cell Imbalance

▶ Cause:
If the cells within the battery are not charged evenly, some cells may have too low voltage, reducing the overall capacity.
When the Battery Management System (BMS) detects cell imbalance, it limits charging and discharging, which shortens the driving range.

▶ Solution:
Use professional equipment for cell balancing or reset the BMS to equalize cells.
Consider expert inspection or battery refill services.

3. Repeated Overcharging and Overdischarging

▶ Cause:
Repeated overcharging and overdischarging rapidly degrade battery performance.
Specifically, fully discharging to 0% or charging to 100% frequently shortens battery lifespan.

▶ Solution:
It is best to charge the battery between 20% and 80%.
Avoid frequent full discharges or overcharging.

4. External Temperature and Environmental Factors

▶ Cause:
In cold environments, lithium-ion battery voltage drops sharply, reducing performance.