This battery has all the criteria required to maintain a quality that mimics the original. For all safety, the batteries are tested, certified and have the required international standards. The PCM circuit board has double protection for overcharging, discharging and short circuiting. We at G-SP always offer a battery that meets the safety requirements to achieve a qualified and high-quality replacement battery. Technical Specifications Battery Type: Li-ionBattery Cell Rating: A++Capacity: 3969 mAhVoltage: 3.82VMax Voltage: 4.35VPCM Card: MCTCharge Cycles: 550+Charge Time: 4 Hours (Depending on Charger)Standby Time: 4-7 DaysCertificates: CE, RoHS, UL, IEC62133, PSE, TIS, MSDS and UN38.3Safety: Dual IC ProtectionMaterial: Lithium-ionCompatible with: Apple iPhone 11 Pro Max Additional Protection Overcharge ProtectionDischarge ProtectionShort Circuit Protection NOTE G-SP is not responsible for any damage caused during the use or installation process.