Constant-current charge

No matter how the battery is lack of the voltage, it can constant-current charge with rating current and limited current to prevent that the battery is charged by over current during initial charging period of the lack voltage battery.
-- the green light indicating constant-current is on

Constant-voltage Charge

When the battery voltage rises to the set value, the charging mode transfers to constant-voltage charge automatically，the capacity of the battery has been around 80％ up to now, and the current is reduced gradually. At the end of the charging, it charges with the constant voltage and reduces the gassing and depolarization of the storage battery as well as prolongs the life of the battery.     
—the yellow light indicating constant-voltage is on

Enough charge indication

Continue to the constant-voltage with small current charge and the capacity of the battery is over 95%, the light of enough charge will brighten up and stop to charge.
–the red light indicating enough charge is on

Uniform Charge

In order to avoid the battery monocase is lagging and the batteries and old batteries are not charged enough in the cold region, the charger features the uniform charge. After the battery is enough charged, press down the uniform charge button once and continuous uniform charge for two hours. It can compensate 10% of the capacity. Please uniform charge regularly or uniform charge once a month. [part of 12v and 24v chargers may not have this function ]             
-- the red light indicating uniform charge is on