Not exactly the answer to your question, but something many people don't think about when charging overnight:
Consider, for a second, your evening routine. After washing up and slipping into pajamas, the last thing you do before hitting the pillow is drop your phone into a charger. Cell phone users around the world have all adopted this habit. But could it be bad for your phone's long-term battery life?
Leaving your phone to re-charge overnight is convenient?you're able to wake up in the morning to a full phone battery that will last through the workday and into the evening. But leaving your phone plugged in after reaching 100 percent is not best for your phone's battery long-term.
Tech tips blog Lifehacker shares some strategies for prolonging a device's battery life, including this advice about leaving a phone to charge overnight:
Similarly, lithium-ion batteries don't need to be charged all the way to 100%. ... If you do charge it to 100%, don't leave it plugged in. This is something most of us do, but it's another thing that will degrade your battery's health.