The V-mod Battery from Transpring is a compact 900mAh vape mod for pen cartridges up to 11.5mm in diameter. The device features variable output of 4.0V, 3.2V, and 2.6V as well as a 1.8V preheat feature up to 15 seconds thats perfect for softening herbal extracts, aiding wicking, and helping to avoid drying the coil.