The general parameters of the charger are the size of the charging current, and the charging voltage, and the charging is generally divided into the fast charging part and the trickle charging part (that is, the slow charging part).
The charging voltage is generally fixed, but the fast charging part is that the charging pulse is longer, and the trickle charging is that the charging pulse is shorter. When the voltage detection of the battery reaches the rated voltage, the pulse stops, and it is full of electricity at the moment