How to Solve Battery Overheating?
3 Answers
If there is slight deformation or no deformation on the exterior, you can fully discharge the battery and use a clean syringe to inject approximately 10ml of purified water into each cell. After the charger turns green, extract the excess liquid, reattach the valve caps, and install the cover plate for use. If the battery is severely deformed, replacement is recommended.
I remember that time the battery got hot, which really scared me, mainly because I forgot to turn off the AC and radio overnight, causing overcharging and overheating. I immediately stopped the car and turned off the engine, letting it cool for half an hour; when checking the wire connections, I found some were loose and as hot as a baked potato. Later, I replaced the aging battery and had a professional repair shop test the alternator and voltage regulator—their normal output should be around 13-14 volts, and anything above 14.5 volts could cause issues. To prevent this, I make it a habit to turn off all electrical devices before parking and regularly check the battery’s health, especially if it’s been in use for over two years, considering early replacement to avoid potential hazards. Keeping the wires clean is also crucial to prevent debris buildup that could cause short circuits and overheating.
The key to detecting a hot battery lies in checking whether the charging system is functioning properly. I usually start by measuring the voltage with a multimeter. If it exceeds 14.5 volts, it indicates an overcharging issue, which could stem from a faulty alternator or a malfunctioning voltage regulator. Next, inspect the wiring harness for any damaged or burnt short circuits. If you notice smoke or severe overheating from the wires, avoid handling it yourself as it's highly dangerous. I immediately stop the car and wait for a professional mechanic to handle it. Additionally, battery aging increases internal resistance, leading to heat generation. I recommend conducting a battery load test every 1-2 years as a preventive measure. Proper ventilation and cooling are also crucial, especially in summer after parking in an enclosed garage. I make it a habit to open the hood for about ten minutes to dissipate heat and reduce heat buildup.
