Designed to stabilize power supply across Senegal's capital region, this lithium-ion battery solution addresses frequent blackouts while supporting solar integration. The Dakar Cabinet Energy Storage System Project represents a groundbreaking initiative in West Africa's renewable. In this paper, a state-of-the-art simulation model and techno-economic analysis of Li-ion and lead-acid batteries integrated with Photovoltaic Grid-Connected System (PVGCS) While lead-acid is budget-friendly upfront, lithium batteries often provide better total cost of ownership (TCO) due to. Work on a solar energy and battery storage project in Senegal, touted to be the biggest in West Africa once it goes live, is set to begin next month after an EPC (Engineering, Procurement and Construction) contract for its development was recently signed. Internal resistance analysis offers clear insights into battery performance: Higher internal resistance leads to more energy loss and shorter standby times. It integrates the photovoltaic, wind energy, rectifier modules, and lithium batteries for a stable power supply, backup power, and optical network access in one enclosure. This versatile energy cabinet supports pole mounting, wall mounting, and floor installation for diverse deployment. Central to this reliability is uninterrupted power supply, and for decades, lead-acid batteries have played a pivotal role in keeping telecom systems running—even when the grid goes down.