Buy a new cell phone lithium battery charge How long before the three? Many of my friends think that we should charge 12 to 14 hours, so as to activate the dormant cells in many businesses is also true when consumers purchase said. Actually, this is not a conclusion, and I personally think that the lack of scientific basis for this view, in fact, after the first three charge and charge the same, 3 ~ four hours is sufficient.
First, we all know that when the lithium battery from overcharging, over-discharge or charge and discharge current is too large, the capacity of the battery life and has tremendous damage and even cause cell deformation or explosion, it is generally in the internal lithium battery are set to protect the electronic circuit batteries. When the battery from overcharging, over-discharge current is too large, will be cut off and the external connections. As some friends, as reflected in: cell phone charger in the boot when a call come in automatic shutdown will cause problems. In other words, the initial battery charge, low voltage, and when a call comes in, the phone to ring, it must maintain a certain amount of power. In the case of low voltage, battery current will increase, excessive current caused by the battery protection circuit moves to cut off the battery and the external connection, causing the phone to automatically shut down.
Second, in order to improve the charging efficiency, lithium first constant current charging with high current to power 90%, the battery voltage of 4.2V, it almost takes about 2 hours; and then to a small constant current charging until the battery is fully charged action until the internal protection circuit, it takes about half an hour, taking into account the battery, charger, individual differences in the products, lithium battery to charge 3 to 4 hours is appropriate.
Taking into account the phone battery indicator error and other factors, when a green light when the charger can charge 1.5 hours more. Another point we should note that lithium batteries will not impose long-term place to sleep, normally require activation before use. Usually after 3 to 5 charge and discharge cycles can be activated. Known under the first two reasons, the lithium batteries expect for sleep through the long charge to activate no sense. Because after the battery is full (about 2 ~ 4 hours), has been movement on the lithium battery protection circuit, cutting off the external power supply. As the role of protection circuits, long charge on lithium Although there is no harm, but the protection circuit will start the energy consumption of batteries, if the protection circuit to lose effect, ranging from damage to the battery, and at the damaged phone, again the idea of the consequences of not . Therefore, taking into account cell phones, lithium batteries and chargers, individual differences, charging three times before and after the charge are the same, only 3 to 4 hours.