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Powertrain by electric battery has been a growing trend in various industries including automotive, manufacture, and agriculture. Electric battery has been applied on several agricultural robots for multiple purposes such as liquid distribution, autonomous harvest, and sensors. In agricultural utility tractor, powertrain by electric battery has potential to replace powertrain by Internal Combustion Engines (ICEs) which commonly use fossil fuel as source of energy. However, application of electric battery power system has not been feasible due to overweight which lead soil compaction, lower speed, and high energy consumption. Overweight values are calculated on 5 utility tractors with different size and output power, in which the results vary from 33.53% to 93.46%. This study aims to optimize the design of utility tractors which will reduce the weight to standard operational weight dependent on tractor size. Alternative components are considered including Li4.4Si battery, Li2Sn battery and Permanent Magnet Synchronous Motor (PMSM) for component selection, system design, and simulation on MATLAB Simulink Simscape. Throughout the process, effect of overweight on tractor speed and state of charge (SOC) are identified. Further, electric battery power system is expected to be applied on utility tractors, replacing the use of ICE and fossil fuel within conventional tractor.