Charging is an important step in using rechargeable batteries. Proper and reasonable charging is good for extending battery life, while improper charging will have a great impact on battery life. Lithium batteries are basically packaged separately according to each product, which is not common to each other. Therefore, each product also provides its own charging equipment, which is not common to each other. When using, it is only necessary to follow their own instructions.
　　Fast and slow charging
For example, the capacitance of one No. 5 nickel-metal hydride battery is 1200mAH, while that of the other is 1600mAH. The capacitance of a battery is called 1C. During charging, when the charging current is less than 0.1C, it is called trickle charging. Trickle charging can fully charge the battery without damaging the battery life, but it takes too long to use trickle charging, so it is rarely used alone, but in combination with other charging methods.
　　When the charging current is between 0.1C-0.2C, it is called slow charging. Charging current greater than 0.2C and less than 0.8C means fast charging. When the charging current is greater than 0.8C, it is called ultra-high-speed charging.
　　However, 1C is a logical concept rather than an absolute value, so the fast charge and slow charge converted according to 1C is also a relative value, just as 200mAH charging current is slow charge for 1200mAH batteries, and fast charge for 700mAH batteries.