Do you read with the backlight on? That will drain a battery fairly quickly. I have a Kobo Forma (which I just love!), but if I use it with the backlight, the charge doesn't last long. However, it doesn't take very long to charge it up completely - usually less than an hour.
A Tree Grows in Brooklyn
The Secret Garden
Mr. Blandings Builds His Dream House
The Snake Pit
Any of the Mickey Rooney-Judy Garland "Hey kids, let's put on a show!" musicals