I've repeated this over many posts so my apologies for those who have to read it again.

Comparing the Jolla tablet to a six year old Galaxy Tab 10.1 (which has constantly been on since the very beginning):
Situation 1: airplane mode on, tablet on but completely unused, no applications running
- Jolla tablet: about 3-4 days, if you're lucky.
- old Android tablet: several months, and I'm not exaggerating in the slightest. I charged it on 20 June, which is now a little under three weeks ago. Only used it for twenty minutes after taking it off the charger, haven't done anything with it since. Just checked the battery level: 89% (no typos: eighty nine percent!).

Situation 2: airplane mode off, Wi-Fi on, tablet unused with a couple of applications and background services (email accounts etc) running
- Jolla tablet: 2 days.
- old Android tablet: it's been a while since I used it this way, but from what I remember it lasts about 2 weeks.

Situation 3: tablet in constant use
- Jolla tablet: actually longer than you would expect based on the other numbers, about 6-8 hours (although this depends heavily on the sort of applications in use, as playing an intensive game or watching hi-res video will drain the battery a lot faster than surfing TMO, for example).
- old Android tablet: about 10 hours (again depending heavily on what you're doing).

Finally, the battery capacities compared:
- Jolla tablet: Li-Ion 4450 mAh
- old Android tablet: Li-Po 7000 mAh (keep in mind the actual current capacity is probably not even half that anymore)