In this chapter, the comparative study based on performance, life-span and economic evaluation of LA and LI battery is done for the grid-connected microgrid system for the residential load demand. . Electrical energy storage systems (EESSs) are regarded as one of the most beneficial methods for storing dependable energy supply while integrating RERs into the utility grid. Conventionally, lead–acid (LA) batteries are the most frequently utilized electrochemical storage system for grid-stationed. . Table 1 provides several high-level comparisons between these technologies. Over 10 million UPSs are presently installed utilizing flooded, valve regulated lead acid (VRLA), and modular battery cartridge (MBC) systems.