Most of us charge our smartphones overnight while dreams of super spec'd flagship phones dance in our heads. But it usually takes just 2 hours to fully power up the battery on our phones. So what are the costs financially if we leave our phones plugged past those two hours while we sleep? And what is the cost of leaving the charger plugged into the wall even if the phone isn't attached to it? Read on to find out!According to Cambridge professor David MacKay, if you unplug your charger from the wall when not in use, over a year you will save the same amount of energy it takes to run a hot ...
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