Dec. 2013, I purchased the FIIO X3 new from B&H in New York,
it lasted 16 months and died!
In March, 2015 I bought the FIIO X5 and tried it,
it was not worth the money, IMO! and returned it.
April, 2015 ordered the X3 II and it arrived 4 months ago today,
I have enjoyed it, I use a 64GB SanDisk Class 10 card,
with a small ext. amp.
Four day ago I started to play it and it was dead,
I charged it for 3 hours fully charged, and turned it off,
this morning I tried to listen again, But within 4 days the battery as died
yet again. I have notified B&H to remove my great review,
and return my money.
Since Dec. 2013, FIIO has made and sold X3, X1, X5, then X3II, X5II,X7
and the reviews only mention the NEW DAP's, never how little time before the batteries die.
Those here on Head-Fi have purchased your products and believed they
were Not just junk from China, obviously many of us were wrong.
FIIO has been so hasty to "flood" the market with FIIO DAP's.
With several FW updates, FIIO now has our money,
but with a growing customer base of unsatisfied users.