The lifespan of lithium-ion batteries can vary depending on several factors, including usage patterns, charging and discharging rates, operating temperature, and manufacturing quality. Generally, lithium-ion batteries can last for several years under normal usage conditions, with degradation occurring gradually over time. However, factors such as overcharging, deep discharges, exposure to extreme temperatures, and physical damage can accelerate degradation and reduce battery lifespan. Proper maintenance, such as avoiding full discharges and keeping batteries within recommended temperature ranges, can help prolong their lifespan.