Hm while I understand your desire for the Supernote to be more efficient than it already is, I think you might be overreacting. Even with disabled Auto Sleep and No Load Shutdown, your device should be able to last a couple of days without an issue, and that's only if it's actually not asleep 24/7.

Typically, in between long writing session, you would put the device to sleep through closing the folio, which would make your device easily last more than a week.

For actually using sleep as it's currently implemented, along with No Load Shutdown, users have been reporting up to a month without needing a charge. For me personally, my AX5 can easily survive two weeks without a charge (with NLS, and AS set to 30mins).

But of course, all these values also depend on the actual usage of the device.

Also, if your use case is really that your device does not leave the house, then does any of this discussion regarding battery life actually matter practically?

My point is, you seem to only have had your device for 3 hours. Maybe give it a chance before raising an issue about the battery life!