Driving an EV until the battery runs out during holiday periods usually results from several combined factors, and sometimes unexpected situations arise despite careful planning.
1. Severe traffic congestion
During holidays, main roads often become parking lots. When cars repeatedly stop and move slowly for hours, although EVs don't consume energy like gasoline cars when idling, running the air conditioning, entertainment, and lighting systems for extended periods steadily drains the battery, making the initially estimated range insufficient.
2. Queues at charging stations: this is the biggest problem during holidays
Long queues at charging stations in rest areas or gas stations are common. Some drivers might have low battery and hope to charge soon but upon arrival face waiting behind 5-10 cars, leading them to risk driving to the next station and eventually running out of battery on the road.
Charging station malfunctions: heavy usage during holidays can cause charging units to fail or be unavailable, instantly ruining planned schedules.
3. Actual driving range reduction
Load weight: during holidays, vehicles often carry heavy loads or full passengers, which increases power consumption.
Weather conditions: driving uphill (e.g., to northern regions) or in very hot weather causes the battery thermal management and air conditioning systems to work harder, reducing the real driving range compared to screen estimates.
4. Driving behavior
Frequent overtaking or driving at high speeds to save time on clear roads (before hitting traffic) significantly accelerates battery depletion.
If you drive your electric vehicle until the battery is completely empty and the car stops, the most important thing is safety and proper actions to prevent damage to the electrical system.
Here are the steps you should take immediately:
Basic safety management
Turn on hazard lights to make your vehicle clearly visible to others.
Shift to neutral (N): If the car still has enough power to change gears, shift to neutral before the 12V system battery dies to allow easier pushing or towing.
Park in a safe place: try to move the car as far as possible onto the shoulder and place a warning triangle behind the vehicle.
Contact emergency assistance services.
Most new EV models offer free roadside assistance during their warranty period via the manufacturer's call center.
Use a flatbed truck only: do not tow with wheels rolling on the road because the electric motor can generate reverse current during towing, potentially causing severe damage to the drive system. The vehicle must be lifted with wheels off the ground or transported fully on a flatbed.
Backup power sources (if available)
Mobile charging: currently, some service providers or manufacturers have pickup trucks equipped with DC/AC mobile chargers to provide enough charge to reach the nearest station.
Upon arrival at the charging station
When you get to the charger, it is recommended to use AC (slow charging) first in some cases if the battery is very hot or voltage is too low for DC charging to start. Normally, you can plug in and charge as usual.
Precautions
The 12V battery may also run out when the main high-voltage battery is empty because the system cannot recharge the 12V battery. This can cause the doors to lock, electric parking brake and screen to stop working. In this case, jump-starting the 12V battery may be necessary to restore system functions and enable charging port activation.
Try not to let the battery fall below 15-20% because in emergencies, the car may enter Turtle Mode, which limits speed and disables air conditioning to extend range for a short distance.
Allowing an EV battery to fully drain (deep discharge) not only complicates vehicle movement but also causes long-term damage to the car.
Battery health
Cell degradation: lithium-ion batteries do not tolerate being drained to 0% (voltage below threshold). Leaving a battery fully discharged for a long time causes chemical reactions that permanently reduce battery capacity, known as battery degradation.
BMS lock: if voltage drops too low, the safety system may lock the Battery Management System (BMS), preventing charging until unlocked by specialized tools at a service center.
Issues with 12V battery (low voltage)
Electrical system failure: although the vehicle is electric, all control systems (lights, display, door locks, electric parking brake) rely on the 12V battery. If the main battery is empty, the system cannot recharge the 12V battery.
Consequently, you might not be able to open doors, release the parking brake, or even charge the vehicle because the onboard computer lacks power to activate the charging port.
Damage to the drive system (if handled improperly)
Motor and inverter: if the vehicle stalls and is towed with wheels turning on the road, the motor can generate back current uncontrollably, causing overheating that may burn the inverter or short circuit the electrical system.
Safety risks
Brakes and steering: when the vehicle is completely off, the brake booster and power steering may not function or operate with limited effectiveness, making it difficult and dangerous to steer the car safely onto the shoulder.
Prevention and solutions
Don't wait until 0%: if battery level drops below 10-15% or the Turtle Mode icon appears, find a safe parking spot or charging station immediately, as this is the last warning before the system cuts power.
If the vehicle stalls, call for a flatbed tow to transport it to a charging station. If charging does not start, you may need to jump-start the 12V battery to reactivate the system.
One complete full discharge may not immediately damage the battery, but frequent occurrences will noticeably reduce driving range in the future.