Our batteries are 100% WITH CE-/FCC-/RoHS-Certified for safety. We only uses high quality materials and 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.