Solar batteries generally last between 5 to 15 years, with lithium-ion batteries being the most common and longest-lasting type, typically enduring 10 to 15 years. Other types like lead-acid batteries usually last around 3 to 5 years. The lifespan depends on factors including battery type, usage patterns, depth of discharge, environmental conditions, and maintenance. Home solar battery systems often require replacement at least once within the typical 20-30 year lifespan of solar panels since batteries tend to degrade faster than the panels themselves.