The claim “Never leave a charger in an outlet without your phone” is partly based on real considerations, but it’s often presented in an exaggerated way.
Here are the 3 main reasons people give—and what the evidence says:
1. It uses a small amount of electricity
True, but usually very little.
Modern phone chargers draw a tiny amount of power when plugged in with no phone attached—often less than 0.1–0.5 watts, depending on the charger. Over a year, the cost is usually quite low, especially for newer, energy-efficient chargers.
2. It may wear out the charger
Partly true.
A charger that’s plugged in continuously stays energized, which may contribute to gradual wear over many years. However, quality chargers are designed to remain plugged in for extended periods, so this is generally not a major concern.
3. There is a small fire risk
True, but uncommon with quality chargers.
Any electrical device can fail. The risk is much lower if you use:
- A charger from the device manufacturer or a reputable brand.
- An undamaged charger and cable.
- A properly functioning electrical outlet.
The risk is higher if the charger is:
- Damaged or cracked.
- Counterfeit or poorly made.
- Used with frayed or damaged cables.
- Plugged into a loose, overheating, or damaged outlet.
Good charging habits
- Replace chargers or cables that are damaged.
- Keep chargers dry and away from flammable materials.
- Don’t cover chargers with blankets, pillows, or clothing while they’re in use, as this can trap heat.
- Unplug chargers if you’ll be away for an extended period or if you simply prefer to eliminate even the small standby power use
