Check that the replacement part is installed correctly in your vacuum, and that it is not visibly damaged or malfunctioning. Be sure to keep the vacuum and its components clean and in a dry, cool place when they’re not in use. Only use the replacement parts for their intended use. If you’ve done all of the above and the parts are still not living up to their expected usage time, please contact our Customer Service team at support@tzumi.com or 1-855-GO-TZUMI for further information.