I went to the store the other day to by some AAA batteries.  The digital books that I listen to require a AAA battery so I decided to buy a package to keep at work.

Spying a 4 pack, I grabbed it off of the shelf.  $10!!!???  Wow!!  But, when I looked at the package, it said that it lasts 8 times longer than regular batteries.

Now, I usually put in a new battery every time I get a new book.  And, a battery lasts about the duration of a book.  So, new book, new battery.

But, if a regular battery lasts for one book, will one of these super batteries last for 8 books?  I doubt it.  Besides, I would need to remember to take the battery out when I am finished with the book. And, while I might remember for the first few books, sooner or later, I will forget and give my expensive battery to some one else.

So, I opted for the regular batteries for $4.