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There are a lot of questions about cell phone batteries. Should you leave your smartphones plugged in overnight? Is it bad for the phone? Bad for your safety? Whats the right thing to do? In fact, how much should you charge your phone? Whens the right time to plug in? Should it go down to zero every time? Up to 100%? How do you get the longest life out of the battery inside a smartphone? Does it really matter if youre only going to keep the handset around for a couple of years before an upgrade...