如何正确给手机充电（How to charge a mobile phone properly）.docVIP

如何正确给手机充电（How to charge a mobile phone properly） How to properly charge lithium batteries for mobile phones? Recently, many readers call or write to ask how to correctly to the mobile phone lithium battery charging problem, it seems that this is a problem we are more concerned about the problem, I say something here: the new lithium battery to buy a mobile phone three times before charging need long time? Many friends believe that 12~14 hours should be charged, so as to activate the dormant battery, many businesses also said so when consumers purchase. In fact, this problem does not have a conclusion, and I personally believe that this argument lacks scientific basis, the actual three charging before and after charging are the same, there are 3~4 hours is enough. First, we all know that when the lithium battery overcharge, over discharge or charge and discharge current is too large, the battery life and capacity are of great harm, even will cause the deformation of the battery or explosion, so generally in the internal lithium battery set up electronic circuit to protect electric core. When the battery is over charged, over discharged, and the current is too large, it will cut off the connection with the outside. As some friends have shown, when a cell phone is switched on, a phone call will cause an automatic shutdown. That is to say, when the battery is charged early, the voltage is low, and when the phone comes in, the cell phone rings, and it must maintain a certain power. In the case of lower voltage, the battery current will increase, excessive current causes the battery protection circuit to act, cutting off the battery and external connections, resulting in automatic shutdown of the phone. Second, in order to improve the charging efficiency, the lithium battery is first in constant current charge to power 90%, the battery voltage is 4.2V, which takes about nearly 2 hours; then the constant voltage charging current, until after a full charge inside the batter