Simplicity in design make this 6 cell lithium ion battery charger 25.2V 4A reliable and safe for operation,. It charges a 21.6V 6 cell lithium ion battery in three phases: pre-charge, constant current and constant voltage. While ensure accurate charging, the Lithium battery recharger is spark proof, compact, features automatic cut off when the battery charging cycle is complete, and with auto-recharge. Effective thermal management enhances reliability greatly to enable the 21.6V battery charger durable to use.