... connecter,better conductive propertiey.8.Satety and stable: Hi-tech lithium battery,undergoes drop test,smash test and puncture test to ensure ... fire and explosion in breaking.9.Grade A Li-ion battery cell,high energy environmental protection ,durable energy conservation,long ... stanby time and long talking time.10.Guarantee time:3-12months 11.Working temp: -15 °C ...