new Oasis battery life

I hope my battery just needed a full charge/drain calibration.

I received it on October 31 with a partial charge. I charged it all the way and it updated to the latest firmware.

The battery died last night.....so that would be 4 days including having read 200 pages with light at 12 of 20.

I only have 3 books on the Oasis so I don't think it was burning battery indexing. Wifi on, Bluetooth off.

How has your battery experience been with the new Oasis?