What Are the Reasons for a Car Battery Getting Hot During Charging and Not Getting Fully Charged?

[BellaMarie]

The reasons and solutions for a battery getting hot during charging and not getting fully charged are as follows: Battery Life Expired: If the electric vehicle cannot be charged, the first thing to consider is the battery life issue. Generally, the battery life cycle is 2-3 years, and the main factors determining the lifespan are related to the user's usage habits. Solution: Maintain the battery properly in daily use. Fuse Blown: If the internal fuse of the battery is blown, the battery will have no power. Solution: Go to a specialized electric vehicle repair shop or the dealership where the vehicle was purchased to replace the fuse. Do not attempt to replace it randomly. Poor Contact: When there is poor contact between the fuse tube and the fuse holder, the electric vehicle battery may not charge or not get fully charged. Solution: Professional repair at a specialized maintenance shop is required.

[Natasha]

I noticed that my car battery gets hot during charging and never seems to fully charge, which is actually quite common. This is usually caused by battery aging leading to increased internal resistance or micro-short circuits, resulting in poor current flow and heat buildup during charging. Another possibility is an unstable output current from the charger itself - excessive current can easily overheat the battery. For lead-acid batteries, low water level could also be a reason, as dry electrode plates reduce charging efficiency. I remember my car had this issue last time - upon inspection, the battery had already bulged, so I replaced it immediately for safety. Don't overlook loose or corroded connections either, as they can affect the charging path. For prevention, I recommend checking battery condition and water level monthly, choosing well-ventilated areas for charging to prevent overheating. Address any issues with professional inspection promptly to avoid battery failure damaging other components. Regular maintenance really saves hassle and extends service life.

[SilasLynn]

As a seasoned driver with years of experience, I've encountered issues like battery charging overheating and incomplete charging several times. Most often, it's due to the battery reaching the end of its lifespan, with internal plate aging or sulfation, leading to high resistance and significant heat generation during charging, which reduces charging efficiency. It could also be a problem with the charger, such as mismatched current output or aging failure. Another point is battery water deficiency: lead-acid batteries require regular water top-ups, otherwise, the electrodes get exposed, making charging overheating more severe. I always remind myself not to charge for extended periods during hot weather, as poor heat dissipation makes issues more likely to arise. If the battery consistently doesn't charge fully, don't force it to avoid explosion risks; instead, take it to a repair shop to test the voltage and check for internal short circuits. Regularly inspect the battery's date and appearance, and replace it when necessary—don't compromise safety to save money.

[BrooklynMarie]

I've experienced this situation: the battery gets hot during charging and doesn't charge fully, possibly due to a faulty charger or an internal short circuit in the battery. The charger's output current is too large or fluctuates, causing heat to accumulate rapidly; the battery itself may be aging or lack sufficient electrolyte, leading to localized heating in short-circuited areas. Don't overlook wiring issues—corroded or loose terminals also affect current stability. I recommend first trying a reliable charger, or letting the battery cool down after disconnecting the power, then slowly inspecting for any bulging or cracks. For safety, avoid repeated charging; replacing the battery can solve the major issue. Also, try to avoid charging in direct sunlight for better heat dissipation and lower risk.