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I don't think Lithium vs AA is really what the title is meant to be.  There are Lithium non-rechargeable AA batteries.  

I much prefer built in batteries over AA.  I've had nothing but issues with batteries dying and not having any to replace them.  And I've had 0 issues with rechargeable. 

I plan on getting a Series X, but a chargeable battery pack will be my #1 priority there.