If it's of any reassurance, initially I also thought I might have a dud battery. But then I read that the device spends a lot of hidden processing time indexing any new books you have loaded (more than 24 hours for 500 books in my case!) and this can absolutely chew up your battery -- so that it seems initially to have a very restricted capacity.
But you may find if this is the case, that it will even up after the next charge. You can check whether your Kindle is still busy indexing by typing '.' at the Home screen and hitting Enter (the main five-way button).
Also bear in mind that most batteries do not reach their optimum until three full charges -- after which it's slowly downhill all the way.....
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