This article documents the results of designing an embedded battery pack for an educational electric kart. The work is based on a previous project where an electric kart drive train was designed. The new lithium ion battery pack design is described and the need for a microcontroller controlled battery balancing system is based. A passive cell balancing solution is implemented as a small cell balancer board. A central control board is designed to collect cell status information, analyze the obtained data and provide information to the end user. The collected information is stored in a memory card for further battery pack performance evaluation. The paper shows an example of obtained charge/discharge data.