US office supplies store Staples has posted a test that lets you measures how fast you read, then tells you how often you'll need to recharge your e-reader.
How fast can you read while retaining information? A short online test geared at selling e-readers lets you test how well you do up against the US national average.
The test has you read a short page, then answer three questions to make sure that you took in the information contained in the text. It then gives you a percentile and places you against average reading speeds as they pertain to education levels, although we are not sure that Staples' source for that data is entirely reliable, so take it with a grain of salt.
After a few interesting facts and figures about how long it might take you to read various books, from War and Peace to Harry Potter and the Philosopher's Stone, you can find out how many books you can read before your e-reader's battery dies, provided you have a Kindle, Nook or Sony e-reader (no love for Kobo).
Again, we're not entirely sure about the accuracy of this. E-reader battery life is mostly measured by page turns, and this is then skewed by lifetime capacity degradation, time-based power drain and the relatively new use of lighting in E Ink devices. Of course, if you are reading on a tablet, the battery isn't going to last as long, but generally speaking E Ink e-readers are going to last a while and, with a battery indicator on the screen, you're not likely to find yourself in a situation where the power cuts out on you unless the battery is defective.
However, it's a fun little test to take. Just bear in mind that the results aren't necessarily indicative of anything of particular substance.
Source: Staples eReader Department