Symptoms
- Charger is hot to the touch, more than just warm
- Burning smell coming from the charger
- Charger stays hot even after charging finishes
- Discoloration or melting visible on the charger casing
Likely causes
- CommonNormal warmth from converting AC power during chargingChargers dissipate some heat as a normal part of their function, especially fast chargers.
- CommonCharger's cooling vents blocked by dust or placement against a wall/fabricRestricted airflow traps heat that would normally dissipate.
- PossibleInternal charger component failingAging capacitors or transformers can overheat as they degrade.
- PossibleCharging in a hot environment or direct sunlightHigh ambient temperature adds to the charger's own heat output.
- Less commonDamaged power cord or plug causing resistance and heatA frayed or damaged cord can generate heat at the point of damage.
What to do
- Place the charger on a hard, open surface away from fabric, walls, or clutter that could block its vents.
- Charge in a cooler area out of direct sunlight when possible.
- Unplug the charger and let it cool if it feels excessively hot, and inspect the cord and plug for damage or discoloration.
- Check that the vents (if any) are free of dust; clean gently with compressed air while unplugged.
- If the charger smells burnt, shows melted plastic, or stays hot with nothing plugged in and charging, stop using it entirely.
- Replace the charger if overheating is more than mild warmth or happens consistently.
Tools and parts
- Compressed air
Replacement battery chargerSearch: “cordless drill battery charger replacement”
Safety
Use caution
Unplug and stop using any charger that smells burnt, shows melted or discolored plastic, or stays hot when idle; these are signs of an electrical fault.