Various embodiments provide a pack for holding and re-charging an e-cigarette. The pack comprises a pack battery; a body portion including a tube for receiving an e-cigarette; a re-charging mechanism for re-charging the e-cigarette received into the tube using the pack battery; and a lid attached to the body portion. The lid can be opened to allow the e-cigarette to be received into the tube, and closed to retain the e-cigarette in the tube. The pack is configured to transition from a higher power state to a lower power state a predetermined period of time after the lid is opened and before the lid has been shut.