... discharge, service life ≥5 yearsStorage battery: valve-controlled sealed service-free colloid, silicon and lead-acid cells with service life ≥5 ... reach >130LM/W, 100000 hours life, 5 years warranty.3. battery: maintenance-free lead-acid or gel battery, over charge and over ... discharge protection, 8~10 years life ( gel ), 3 years warranty. ...