Finally got my Joye 510 w/ auto USB pass through. Oh yes! I knew the e-cig was a worthwhile investement. A couple ?s: How long should I let the PT charge before using it? Also, the instructions say to charge the 510 batts for 8 hrs the first time charging even if the LED is green. I have never heard that before, and I don't see how that would effect it because of the overcharge protection. Thanks in advance.