The newest edition from Lo Key Battery has arrived and features variable voltage settings so you can adjust the temperature according to your oil and desired hit. Lo Key battery is a standard 510 thread battery and works with all your favorite 510 thread cartridges. When not in use, the cart stays tucked into the side of the battery to prevent your cartridge breaking in your pocket. Just push the corner button and the cart will pop out. The USB charger is built into the side so you won't have to worry about losing it and fully charged, it has a 4 hour battery life - so it won't die quickly like other pen batteries do.  

Specifications

• 4 hour charge time
• Protected cartridge
• Variable Voltage Settings: 2.7V | 3.1V | 3.6V