Cellphone has been a part of our life, which is more acceptable in classroom. When smartphone become popular, its size and function have been improved all the time, but the battery can't last as long as its original situation. We need to charge smartphone when we see the warning of rest battery. Most people like to charge the phone before they sleep, then the next morning the 100% battery on screen makes them feel comfortable. But according to the latest study, a new research showed that full battery is not the most suitable situation for smartphone. It is best to maintain 60% to 70% battery, because full situation is a burden to the phone. So don't let your phone charge the whole night, or it will damage the long-term use of battery. 手機已成爲我們生活的一部分，在教室裏使用手機也變得更加可接受。智能手機變得流行時，它的大小和功能也不斷得到改善，但電池卻不能維持原來的狀態。當看到剩餘電池的警告時我們需要給智能手機充電。大多數人喜歡在睡覺之前給手機充電，然後第二天早上看到屏幕上電池100%的情況就使他們感覺舒服。但根據最新的研究，調查顯示，滿電的電池對智能手機並不是最適合的狀態，最好是保持60%到70%的電池，因爲滿電是一種負擔。所以不要讓手機充電充上一整晚，這會損害電池的長期使用壽命。
