Our batteries are 100% WITH CE-/FCC-/RoHS-Certified for safety.    We only uses high quality materials and grade A battery cells to ensure true capacity and more recharge cycles.    Expected operation time: 2-4 hours. This may vary, depending on device type and the way it is used.     Contain with Durable cells; Low power consumption IC design.     Overcharger and Discharger Circuit Protection.    Equipped With Higher Quality Cells yet has Same Size & Shape as an OEM Battery.