Very nice , excellent review ,
Can you please clear that the MaGaosi K5 and ToneKing 5BA are the same product or they are different ,????

I have not had the ToneKing 5BA in hand to confirm.

It seems this are the old version. They released a new version with an "upgraded cable". You can know by looking at the color of the box the old one is white and the new one is black/

Yep if you look at the date posted, I was in the very first few people who got the K5. I think those of us who wrote these early reviews may have been the reason for the V2 as the original cable was pretty universally disliked.

Wondering how long does the bluetooth battery last? Also how do you compare this to the TFZ King Pro?

I don't use bt a lot but have used it at work all day without needing a charge. King pro has a bigger sound stage and more bass depth and sub-bass quantity while K5 has a bit better lower mids where the KP can sound a bit thin.