iMac power supply died, and I decided to replace instead of fix. The day after I ordered the replacement, my iPad screen failed to light the screen. That I intend to fix, but I didn’t want to touch until I could load the backups form the old disk drive onto the new computer.
Took nearly a month (long story) for the new computer to arrive, during which the iPad has been untouched on the coffee table. Every once in a while, including today, it makes the new mail sound.
And I just confirmed with the iPhone that it is still online and reporting its location.
When it was in full use, it was down to 20% or less every night. I expect sleep to use less power, but that really surprises me. Is that big a difference typical?