This varies depending on the standard of batteries installed and the frequency the handle is used. Please see the recommended battery life for each product:
Origin: New AA batteries will last roughly 6-12 months depending on the above factors.
Breeze: New AAA batteries will last roughly 6 months depending on the above factors.
Mirage: A full charge will last up to 200 days or 4,000 operations depending on usage and environment.
We recommend that batteries in the Breeze and Origin are changed every 6 months for optimum performance.