Discharge rate refers to the number of times the rated current is discharged. This is the capacity. For example, for a 2000 mAh battery, the rated current is 2000 mA, then 0.5 C is 1000 mA, and 2 C is 4000 mA.
Generally, the charging current of lithium batteries is set between 0.2 C and 1 C. The higher the current, the faster the charging and the hotter the battery. Additionally, charging with too much current will not fully fill the capacity because the electrochemical reaction inside the battery takes time. Just like pouring beer, if you pour it too quickly it will produce foam and make it unsatisfactory.
There are several points to note when discharging lithium batteries:
First, the discharge current should not be too large. Excessive current will cause internal heating of the battery and may cause permanent damage. .On mobile phones this is no problem and can be ignored. The higher the battery discharge current, the lower the discharge capacity and the faster the voltage drops.
Second, you should not overload! The internal storage of electrical energy in lithium batteries is achieved by a reversible chemical change in electrochemistry. Excessive discharge will cause an irreversible reaction of this chemical change. Therefore, lithium batteries are more afraid of over-discharge once the discharge voltage is lower. exceeds 2.7V, it may cause the battery to be discarded.
Detailed information
Precautions for using lithium batteries:
1. Avoid use in harsh conditions, such as: high temperature, high humidity, prolonged exposure to summer sun, etc. Avoid throwing batteries into fire.
2. When removing the battery, make sure the electrical appliance is turned off and the operating temperature should be kept between -20 and 50℃.
3. Avoid “storing” batteries in unused electrical devices for long periods of time.
Baidu Encyclopedia - Lithium-ion battery
Yes. The principle is that the state of charge of the four cells before assembly is the same, which simply means that the open circuit voltage of the four cells is the same. Then first connect the four cells in parallel, then connect them to the boost protection board. The general protection board has two ports, a USB port and a Micro USB port. The following diagrams are used to illustrate:
1. First, discharge all four cells until there is no more electricity. The open circuit voltage difference does not exceed 10 mV.
2. shown in the figure below MMethod: Connect all the positive poles of the four batteries together, connect all the negative poles together, and use spot welding nickel sheets to connect. Touch the connected wires individually.
3. Connect the positive and negative wires to the boost protection board as shown below. There are many manufacturers of this card. The key is to consider its conversion efficiency and whether the charge and discharge protection circuit is. complete. The positive terminal of the batteries connected in parallel is connected to the battery + in the figure below, and the negative terminal of the batteries connected in parallel is connected to the battery - in the figure below. When charging homemade mobile power, the USB terminal of the mobile phone data cable is connected to the USB port of the computer, and the Micro USB terminal is connected to the Micro USB port of the mobile power supply when charging.mobile power; charges the mobile phone, the USB terminal of the data cable is connected to the USB port of the computer. Simply connect the USB port of the mobile power supply and connect the other end to the charging port of your mobile phone.
4. If charging efficiency is considered, when choosing a protection board, you should consider whether it is 1A or 2A output.