Hi all. Came to this thread for a bit of help with a charging issue. My original TC20 was charging fine (I think) but after a few weeks the button light wouldnít turn any colour when the usb was plugged in. I had it replaced very quickly by ThruNite, however the replacement has exactly the same issue. Iím sure Iím doing everything right (white cap removed, head & tail screwed tightly, cable working in other devices etc) but Iím new to flashlights. Is this a common issue? Is there a simple solution?