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. PCM printed circuit board has double protection for overcharging, discharge and short circuit. 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: 3110 mAhVolt: 3.82VMax Volt: 4.35VPCM Short: MCTLaddcycles: 550+Charging time: 4 hours (Depending on charger)Standby Time: 4-7 DaysCertificate: CE, RoHS, UL, IEC62133, PSE, TIS, MSDS and UN38.3Safety: Dual IC ProtectionMaterial: Lithium-ionCompatible with: Apple iPhone 11 Supplementary Protection Overcharge ProtectionDischarge protectionShort circuit protection OBS G-SP is not responsible for damage caused during the use or installation process.