Both of my 510 batteries are no longer holding a charge after only 30 days of use. Battery life has been dropping over the last few days, and now I'll get 4 or 5 puffs off of them, then the LED will get dim and vapor production will drop significantly. Same atty will work perfectly fine with my USB pass through. I'll generally charge each battery 2 or 3 times throughout the day. I know they eventually wear out, but should they be dead after only 30 days of use?