I have an XPS 13" 9350 that is about 2.5 years old.  My battery continues to deteriorate and is only getting about 3 hours on a full charge I ran a battery test and although the design capacity is 55,997, the full charge capacity is down to 35,272.  Thus I'm guessing I need a new battery.  

Question, where should I buy one?  And can i do it myself?  I'm afraid of the pin connector, i screwed one of those up in an old computer.  Any help is appreciated.

Thanks

Chris