whats "smoky blue"? in the name of the player?

I dont know .... It is how the product seems to be registred in the DB.
Anyhow ... you could say it has a bit a blueish tint to it.

What is the battery life (and with what files)? 

I can run around fro 2 to 3 working days. I use the player mostly at work.

Battery life is good to great (and you could always extend with a power pack, like with a mobile phone)

It is not really blue but dark grey instead...the battery is great 3,150mAh...excellent sound; worth the money and very similar to the AK120II; no reason to get that one unless you need more space and two DACs.