Hi robert1p. Thank you for letting us know about this - we're certainly curious to investigate it.
Would you be willing to send us a diagnostic report from the 1Password for Windows app on that device? If so, that would give our team a chance to understand what may have contributed to that power usage, and what we might do to improve the situation.
You can reach us at support+windows@1Password.com. Let me know if you'd like the specifics on how to generate the diagnostic report, and we'll hope to connect with you by email!