I purchased an ego-t upgrade battery yesterday. The included charging cable is defective I think. I threw the battery on the charger a few hours ago (nothing was lit up and I'm not sure if it's supposed to). After roughly 2 hours on the charger it was still totally dead. No blinking lights or anything. Luckily I still had my old charger from my old cheap pv. This seems to be working (it also has ego charger branding on the back). So do you think the usb cable or pass through charging port is defective? After about 5 minutes on the top charging area it gave me a full hit. I plan on making a trip to my b&m in the morning to purchase a spare battery and to discuss this issue. I just wanted some input from seasoned vapers before I went. I look forward to any input! 