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Just to be clear, way in the past Kobo would claim 60 days of battery life for some of the ereaders. Then they claimed 30 days for the later devices. Now, the claim "weeks". From memory, the Aura ONE was the last one that used the time and it was the latter.
The original claims were based on 30 minutes of reading. So, the claimed battery life means 30 and 15 hours. Using the latter, 10% is 1.5 hours. That is worse than what you are seeing, but, it depends on what you are doing.
If the only thing you are doing is reading, then it isn't good. But, the more you turn the page, the faster the more power is used and the faster the battery is used. If you sit there paging through the library, it will use a lot of battery. What you read will have an affect on the battery life. Reading comics will probably use more power as the graphics have to be rendered and the pages are turned more often. And a faster reader will also run the battery down faster.
Other actions such as when new books are added will use a lot of power. Each book is read to get the metadata and update the database. That is going to be CPU and disk intensive, so adding a lot of books in one hit will use a lot of power. That's the only impact using calibre will have. But, odds are it will roughly balance out as when you have the device connected to add the books, it is charging the battery.
As @NiLuJe said, you need to use it and learn what the battery usage is like when you are just reading.
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