Control seal design without free electrolyte maintenance free. Clothing design life. 15 years (25 ℃). Operating temperature range -35~60℃. Thickened substrate design, long life. Self-discharge rate is less than or equal to 3% per month. JL column is made of highly elastic AGM separator and thickened plate, as well as special lead-paste formula. The battery has stable charge-discharge performance, small self-discharge, long life, and is very suitable for telecom, power system and other equipment.