... after 2000cycles; Ultra-safety: No burning and explosion ,even the battery is misused or its interior and exterior are damaged Quick ... , non-toxic, pollution-free. RoHS compliantSpecification:Rated voltage: 6VRated capacity:6.5AhCharging cut-off voltage:7.4VDischarging cut-off voltage:4VMax ... , laboratory instruments and devices, and other special equipments. lithium ion battery pack 6V-6.5Ah