The battery does not affect the operation of the media player. It is just the date/time unable to synchronised upon startup after you have shit down the unit. It could be an annoyance for some. I read this solution from Zidoo official forum and realised that there is an absence of the cell battery which used to come in bundle with older models like Z9S. I agreed with Peng, opening up the player could void warranty as such it will be better to wait for the solution from official source.
I will make sure to state that in my sale that the warranty for my Z9X considered void because I have opened it before even though the set is working fine.