Features:Original JYU L40 15.2V 3650mAh LiPo battery.Battery capacity increase: Compared to hornet s battery, hornet 2 increased the capacity of battery 44%, upgrade LiPo 3s battery to LiPo 4s battery, allows you fly 28 mins of FPV version and 20 mins of Aerial version.Built-in MCU: MCU (Micro Control Unit) is a small computer on a single integrated circuit. A microcontroller contains one or more CPUs. The built- in MCU can manage every single battery separately, balance the power of each battery. It will protect the battery when you not use it.Battery cooling design: Compared to Hornet s, the structure of Hornet 2 has also been redesigned, each piece of the battery have gaps, the air flow can pass through the gap, take away the heat, reduce the battery temperature.Durable and stable: can be recharged multiple times and with stable performance.