Is it possible to manually adjust the height of Reverb AXS™ if the battery has died? February 06, 2019 15:55 No, a battery is required for operation. Related articles Is water ingress covered under the warranty for the post? And for how long? Can I creep the post up a little using the controller, or is it full extension only? How does Vent Valve work? What can I adjust in the App and what information can I get? Does the post drop on controller command without using my bodyweight?