What to Do About Under-Voltage Protection?
3 Answers
If the electric vehicle displays an under-voltage warning while driving, the battery will be in a discharge state whether it is in use or not. Use a dedicated electric vehicle charger to fully charge the battery. First, confirm whether the battery is fully charged. If the battery is fully charged but the electric vehicle still shows an under-voltage warning, check the wiring and the battery level display meter. Check whether there is poor contact at the battery terminals or if the battery tabs are broken. Gently tug on the wires, as some may be corroded internally without visible external damage.
I once encountered an under-voltage protection issue while driving when the battery voltage suddenly dropped, nearly causing the car to stall. Fortunately, the system activated protection. I immediately turned off the AC and music to reduce the load, then used a multimeter to check the battery voltage and found it was only 10.8V—way too low. After that, I borrowed a friend’s charger to charge the battery for a few hours, and it recovered. Since then, I’ve made it a habit to regularly check the battery condition, especially during summer when high temperatures accelerate aging, so I service the electrical system every six months. Also, keeping a portable jump starter in the car is practical for emergencies—if the battery dies while out, I can use it directly. It’s also important to always turn off all electrical devices like headlights and navigation after parking, as developing this habit significantly reduces the risk. In short, while under-voltage protection can be troublesome, troubleshooting it yourself is manageable—just don’t ignore the warning lights.
Once while on a business trip driving on the highway, the dashboard showed the under-voltage protection light came on, and the car started shaking. I immediately pulled over to the emergency lane and turned off the engine, taking a moment to calm down. A friend suggested trying to restart it, and if that didn't work, to call roadside assistance. Later, I used my portable phone charger connected to the cigarette lighter to charge for a while, and surprisingly, it worked. Since then, I've learned some simple preventive measures: check the battery weekly for any signs of corrosion, clean the terminals to ensure good contact. If under-voltage happens frequently, it might indicate insufficient alternator output, requiring professional inspection. From a safety perspective, avoid driving with under-voltage as it can lead to breakdowns or accidents. It's best to keep a voltage monitor near the dashboard to keep an eye on the battery status. These small steps have helped me avoid major troubles, saving money and giving peace of mind.
