We will release the new firmware within this week.
I have 5 of the batteries that are marked Samsung from the seller on eBay. They all charge up fine in the Anker battery charger I got or in the DX50 or 90. They all sound better than the original battery or the Anker battery. And they all have solid printing, a clean finish to the batteries outside and individual serial numbers. I wonder if the eBay seller got a bad batch, has some bad batteries mixed with good. Whatever the case, it is unfortunate that he is sending out some batteries that are bad and I am sorry that more have not received good batteries, as they do make a difference, a positive one, IMO.
Have you tried charging your batteries in the DX90 itself, or only in the Anker charger? It would be interesting to see if any of yours reach a full charge in the DX90.
Yes, all 5 reach full charge in the DX90 or 50. I plan on paralleling two of them for an extended battery life and possibly even lower ESR.
I'm feeling something from the Samsung battery from Jamato's link... not exactly sure if I'm truly hearing it or not, but it does seem like the treble is a bit smoother compared to the pisen. Will have to do some more listening later.
Quick question; I hear that the DX50 required a lot of updates before it started working well and that we can expect the same of the DX90. Are these all firmware upgrades or does iBasso upgrade the player hardware as well?
They are all firmware upgrades. The DX90 operates fairly fine imo.