Thanks for reaching out here in Roku Community.
We're sorry to hear about the battery drain issue with your remote. We're more than happy to help. Have you tried to re-pair the remote and see if it helps resolve it? To help troubleshoot the issue further, follow this link: How to fix your Roku voice or simple remote that is not working.
If the issue is not resolved, please reply here with the serial number of the Roku device associated with the affected remote. It can be viewed by navigating to Settings > System > About.
Once we have the information needed, we'll be able to forward it to our support team for further assistance.