Data from the International Energy Agency indicates that about 40% of inverter batteries may need replacement after three years of use. However, simply Googling “inverter battery lifespan” and changing them after the lifespan ends isn't the best possible advice you could take, as there are a lot of nuances when it comes to how often you should change your battery. To extend the lifespan, consider factors such as usage, maintenance, and environmental conditions. Proper. While the inverter unit can last for many years, the battery is a consumable component with a finite lifespan. Knowing when to replace it is key to ensuring your power backup system is reliable when you need it most.