These 350mAh batteries are perfect for your everyday vaping use! The compact design makes them discreet, and they can be recharged quickly with the included USB charger. These batteries feature an autodraw system; no buttons to press or hold, simply charge your unit, attach a compatible 510 thread cartridge, inhale and enjoy! Available in 3 colors and utilizing a subtle LED light to indicate use, you will love these batteries! These batteries are compatible with industry standard 510 thread cartridges, including C-CELL cartridges!