Hello! I have HUION KAMVAS GT-156HD V2. In my box was two pens, original and marked as a gift. I tried to use both pens right after unpack display and they not works. But both pens works with wire normally. I tried to charge both more than couple hours with original wire, indicators on both pens a glowing with white color endlessly, and not works without wire.
Thank you for reporting your issue with your pens and I'm sorry that your pens won't work without being connected to the charging cable. This happens when the Li-Ion battery can no longer hold a charge. Please contact us through email@example.com to claim your warranty. Thank you and enjoy your day.
HUION Customer Support