Hi! So I got the Fiio Q1 MkII but I was wondering can I charge it when the battery isn't low or completely dead? I mean for example if I listen to music for 3 hours and there is still a lot of battery left can I charge it to make sure the next time I listen I have full battery and it won't run out at some point? Or is that bad for the battery and do I have to wait until it's low or dead to charge it?