The Dyson V8 battery is built to deliver consistent suction, but its lifespan depends on how you treat it. On average, a Dyson V8 battery lasts around 3 to 4 years with regular use. Many users expect it to run like new forever, yet over time, charging cycles reduce its capacity. Using max mode frequently can drain the battery faster, shortening the runtime. To extend life, avoid overcharging and store it in a cool, dry place. Genuine Dyson replacement batteries can restore lost power when needed. With proper care, your Dyson V8 battery can stay reliable far longer than expected.