How much electricity does a phone charger use when left plugged in?

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Cell Phones use approximately 2 to 6 watts when charging, while a charger left plugged in without a phone will consume 0.1 to 0.5 of a watt. Charging an iphone or android phone under normal use conditions will typically cost under a dollar for a full year.

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Millions of idle chargers left plugged in 24/7/365 translate into millions of kilowatt hours wasted every year. And each kilowatt hour equals about a pound of CO2 released into the atmosphere .

But Kathryn Senior, PHD, writing for EnergySavingSecrets.co.uk, says a mobile phone charger plugged in to the power supply without being connected to the phone uses only 0.25 watts.

Phones will get to 80% quickly if you're doing a fast charge. Pull the plug at 80-90%, as going to full 100% when using a high-voltage charger can put some strain on the battery.

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