Scientific paper ID 2805 : 2026/4

The paper presents the modernization of the traction power supply system for a small remote-controlled electric vehicle, originally operating with six series-connected AA batteries. The electrical parameters of the original configuration were analyzed, where the voltage varies within the range of 5.6–9.9 V, this voltage interval is considered the baseline for which the vehicle`s electronic components are rated. A replacement consisting of four lithium-polymer cells arranged in a 2S2P configuration is proposed, equipped with a 2S Battery Management System (BMS) for overcharge, deep discharge, and overcurrent protection. The new battery pack provides a voltage range of 6.4–8.4 V, which remains well within the system`s permissible limits and reduces the electrical stress on the motor and control electronics. The modernization also s the implementation of a charging system utilizing a constant current/constant voltage (CC/CV) algorithm, ensuring safe and efficient charging. The environmental benefits of eliminating single-use batteries are discussed, highlighting that a single lithium-polymer battery can replace 1,200 to 5,000 disposable AA cells, thereby significantly reducing waste and carbon footprint. In conclusion, it is demonstrated that the modernized system is more efficient, more reliable, and ecologically sustainable, while maintaining full electrical compatibility with the vehicle`s original design.