Update. I will charge the unit, via usb. Used it on a drive in my car maybe 20 mins. Turned it off. I tried to power it back up about a half hour later, and it won't start. So I plug in the usb cable/charger in my car to the unit. It boots up, showing as 80% battery. Seems either there is an amperage problem with the battery or something else is going on? I'm near the point of just calling it a loss and looking to another company for a DAP. Maybe I'll just stick with using it for what I intended it for, as a USB DAC. I'll look into a unit for my car. Can't expect great sonics inside a moving vehicle anyway. I don't believe this is what iBasso intended it for either. Still, this must be embarrassing for them. I hope they get the issue straightened out straight away. I like to use it occassionally as a portable DAP. I'll send it off for the replacement battery but will this issue come up again later?
charge only with the supplied cable, otherwise you risk to damage the battery.