The aviation industry has begun to propose electricity as the main power source of future aircraft; The concept of gradually replacing non-electrical devices with electrical devices has been prepared. Work has accelerated in the search for aircraft designs developed for defined and clear targets. The biggest obstacle to maintaining this pace is the development of energy density storage methods. In order to ensure performance towards targets, batteries can be monitored with different key performance indicators (KPIs) such as charge, power, energy and temperature. Battery performance continues to improve in line with the regulations and targets set by different authorities within battery management systems. Batteries continue to develop in providing more and more effective propulsion to engines used in aviation.