What is difference between 3 stage and 7 stage battery charger?

Chargers are widely used in various fields, especially in the field of life, they are widely used in common electrical appliances such as mobile phones and cameras. It generally charges the battery directly without going through any intermediary equipment and devices. 

The three-stage charging theory in the charging process can greatly improve the charging efficiency of the battery, shorten the charging time, and effectively prolong the battery life. The three-stage charging adopts constant current charging first, then constant voltage charging, and finally uses float charging for maintenance charging.

The seven-stage charger has sufficient power and stable performance. It can really repair the battery. It is a rare repair charger on the mains. The 7 stage includes: Desulphation, Soft start, Bulk charge, Absorption, Battery Test, Recondition, Float.