HIGH QUALITY Li-ION cells are used in production . Aging-Test for every battery before packing. 100% OEM Compatible. Our batteries are rigorously tested for capacity, voltage, compatibility and safety to exceed original equipment manufacturer specifications. All of our laptop batteries have passed stringent quality assurance procedures to achieve international standards such as ROHS, CE, UL, ISO9001, ISO9002 certification. Over charge and discharge, detection protection. High abrasion resistance shell. Environmental products.