Hi there,
Thank you for reaching out.
Does the ezCAN go into sleep mode a few seconds after the ignition is turned off? If the Green LED on the ezCAN turns off, this tells us the ezCAN has gone to sleep. In the sleep state, the ezCAN power draw would be inconsequential.
Were you able to test for any more draw with the bike turned off?
Lastly, how is the bike stored? Litium batteries can misbehave (oversimplification, I know) or fail prematurely if exposed to sub 0°C (32°F). It's recommended to keep these batteries between 0-25°C when in use and charging.
Kind regards,
Werner.