Almost all of us have been cautioned against charging our smartphones overnight. It is said that overnight charging is bad for the battery. As per Battery University, a website run by the company Cadex, if you are charging your phone when it is already fully charged, you are pushing the phone in a high-stress, high-tension state. This high-tension state affects the chemistry within and does lasting damage to the phone’s battery. Well, it turns out; this is not exactly the case!
According to tech author Jesse Hollington, charging your iPhone or any other modern smartphone doesn’t cause any damage your battery. He says: “You simply can’t overcharge an iPhone, or any other modern electronic device, for that matter.
Any device that uses a Lithium Ion or Lithium Polymer battery must incorporate a charging circuit that cuts off charging power when the battery reaches 100%.”Apple, Samsung and all the top tech companies – almost of whose products use lithium-based batteries – use this best practice.
He also informed about another very interesting and useful fact. According to Hollington, “Lithium Ion batteries are rated for a limited number of “charge cycles’ (about 500 in the case of the iPhone), the term “charge cycle” refers to complete recharges, and partial recharges simply use up partial charge cycles. In other words, every time you charge your iPhone up from 90%, you’re using 1/10th, or 10%, of a complete charge cycle.
However, if you deliberately drain your battery to zero and then recharge it, instead of simply plugging it in when it needs to be charged, you’re needlessly using up a complete charge cycle.” So, this is all clear now and simple, overnight charging does not harm your smartphone but yes avoid draining it to zero levels so that you don’t use up those ‘charge cycles’ unnecessarily.