Duet Dual Concealed Carto Battery

Duet is a dual‑cartridge 510 battery designed to hold two cartridges at once. With two 510 connections powered by a shared 650mAh battery, you can switch between cartridges without swapping devices. A single button controls operation, while LED indicators show battery life and active cartridge selection. This design is ideal for users who prefer variety or want a backup ready at all times.