Hey so I got a gpen on ebay a while ago, and for a few days it worked great. One day I'm just hittin it and the light blinks 8 times to signal that it's out of battery. I charge it up, the light's green to indicate that it's done charging, so I take it off the charger and try to hit it again. The thing doesn't heat up at all and instead blinks 8 times, like it's out of battery. I'm like... what the hell... so I charge it again for another couple hours, it says it's done, but the same thing happens again. I've probably repeated this process a dozen times and every time it just blinks 8 times like it's out of battery. Has anybody had a similar issue with their gpen? This is the original gpen by grenco, I'm using the original glass vaporizer tank for oils and waxes... is there any way to fix this, or is my battery just permanently dead now?