The lifespan of a cordless vacuum battery can vary depending on several factors, including the quality of the battery, the frequency of use, the charging and discharging patterns, and the overall maintenance of the battery. Generally, cordless vacuum batteries are designed to last for a certain number of charge cycles.

A charge cycle is typically counted as using the battery from 100% capacity to 0% capacity and then recharging it back to 100%. The number of charge cycles a battery can endure before its performance starts to degrade can vary between different battery chemistries and manufacturers.

Lithium-ion (Li-ion) batteries, which are commonly used in cordless vacuums, are known for having a relatively long lifespan compared to other battery types. On average, a well-maintained lithium-ion battery can last for several years or around 300 to 500 charge cycles before experiencing a noticeable decline in performance.

It's important to note that battery lifespan can be influenced by factors such as temperature extremes, overcharging, deep discharging, and leaving the battery unused for extended periods. Taking proper care of the battery, following the manufacturer's instructions for charging and storage, and avoiding extreme conditions can help maximize its lifespan.

If you find that the battery of your cordless vacuum is no longer holding a charge or providing sufficient runtime, it may be time to consider replacing the battery. Contacting the manufacturer or referring to the user manual for specific information and recommendations regarding battery lifespan and replacement is advisable.