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（1） High voltage charging: This charging method does not have a dedicated control circuit, and the battery with a protective board is charged directly with a 5V power head (or by stringing a diode to reduce voltage), completely relying on the high voltage limit of the protective board. The characteristic is that the current is high at the beginning, then gradually decreases and floats at any time; Most of the ones that will explode are of this type, commonly found in low-end card MP3s, etc. High end ones cannot afford to buy and do not understand– I dare not say that such an expensive machine should have a charging circuit; There are many things that should be done, but there are more things that should be done but not done;

（2） Constant voltage charging: This method is similar to the previous one. Constant voltage is actually a voltage limit, setting a relatively accurate maximum voltage, and then charging to that voltage. If the voltage is less than 4.2V, it will never stop. Jianghu people call it foolish to charge. If this charger makes the cut-off voltage very accurate, it will be safe if it is too low. If it is too high, it still needs to rely on a protective board, and as for bare batteries, it's a blessing in disguise. Commonly seen in today's mobile phone universal charging and flashlight direct charging, these chargers cost less than a yuan and are all made up of inferior parts. The retail prices on Taobao range from 2.00 to 15.00, and it's hard to say how long they will last;

（3） Constant current charging: This method still originates from the previous and previous circuits, but limits the maximum charging current. Constant current and constant voltage are actually current and voltage limiting, and can be considered as the son of foolish charging. This type of circuit is more popular, such as Nanfu and Xinyu, which do not completely cut off after overflowing, and instead uses trickle floating charging; Currently, it is believed that prolonged low current charging is one of the causes of battery bloating;

（4） Intelligent charging: This is currently considered an ideal charging management method, following the charging algorithm mentioned at the beginning of this section, integrated into a small chip IC, with simple peripheral circuits and stable reliability, such as TP4054/4055/4056/4057, TP4002/5000, MAX1879, and so on. The crucial feature of this type of chip is that it will simultaneously monitor the voltage and current when determining whether it is overflowing. It will stop charging at 4.2V or when the charging current is less than 0.01C (usually around 50mA); Completely cut off after overflow, without trickle floating charge, but monitor the voltage at any time. If the battery voltage drops to a certain value, start charging;

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