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. 手机已成为我们生活的一部分，在教室里使用手机也变得更加可接受。智能手机变得流行时，它的大小和功能也不断得到改善，但电池却不能维持原来的状态。当看到剩余电池的警告时我们需要给智能手机充电。大多数人喜欢在睡觉之前给手机充电，然后第二天早上看到屏幕上电池100%的情况就使他们感觉舒服。但根据最新的研究，调查显示，满电的电池对智能手机并不是最适合的状态，最好是保持60%到70%的电池，因为满电是一种负担。所以不要让手机充电充上一整晚，这会损害电池的长期使用寿命。
