The Trust Fire XTAR WP2II Multi Charger is the very best battery charger for the IMR High Drain AW 18650 re-chargeable batteries used in the LAVATUBE. This charger can also charge many other battery sizes with its adjustable base The Trust Fire Multi-charger has room for two batteries with indicator lights to tell you when a battery is in a charging cycle and when it has completed. It also has a USB output. It usually takes about 2 hours to fully charge your batteries. Get one today and fire up those LAVATUBEs!