... Dash 3G Snap , S520 , S521 , S522 battery1.used original Taiwan battery core,completed in china;2.Dual IC and pcb,1000 ... properties, not easy to rust.3. Safety and stable: Hi-tech lithium-ion battery undergoes drop test, smash test and acupuncture test ... in breaking.4. A grade li-polymer battery cell, high energy environmental protection battery, durable energy conservation, long standby time and ...