Well, mine arrived dead . Does not keep the charge at all. Only works whilst plugged in the charger or PC USB port . The moment you unplug from the charger it goes back to the tomb. Contacted Massdrop support and they issued me a full refund. I have to say C5 built feels like a proper cheap Chinese knock off. Nowhere near the quality of built of my FiiO E12 Mount Blanc. I opened C5 up and QC is schocking. Just look how PCB looks like.