Perfine LG G4 Battery g4 Extended Battery 8200mAh Li-Polymer Battery Replacement for G4/BL-51YF with Full Edge Protective TPU Case SPECIFICATION8200mah battery for LG G4(up to 273% capacity of the standard battery).This will just add some weight and size to your phone, then you get get Up to 2.73x battery power to you phone,No longer have to worry about mobile phone power halfway dead!And the thick Full edge Protection Cover case protects your phone from scratches and other everyday wear and tear,provide softer side that safely holds your phone,easy to click all buttons and ports. COMPATIBILITYCompatible with all major wireless Carriers mobile models:H810(AT&T),H811(T-Mobile),H812, H815,VS986(Verizon),LS991(Sprint),US991. UPGRADED MATERIALLi-Polymer has more stably,safety and higher energy density for it's physical property,Smaller size, more durable under the same capacity,every aspect are better than lithium-ion,suitable for any users.Built-in temperature sensor integrated IC chip to protect the phone from any over-heating safety hazard. SAFEGUARDCE,FCC and ROHS certified,rank top10% A+ battery cells,at least 500 charge circles hold the power stably,Support high-speed,efficient charging.Factory sold directly ensure 100% new,no memory effcect,each battery through the use testing,power testing,installation testing,to ensure that all are perfect before the packing.If there still have any problems,just contact us,we will keep the service until you 100% satisfied! SERVICE30 days no-reason return,180 days tracking service warranty.We focus on mobile phone batteries,welcome to consult any questions about battery.We use quality and service to maintain every customers.