400mAh Slim 510 E-Cig Vape Pen Battery, is perfect for on-the-go use and offers a range of features to cater to your vaping needs. It is a compact and lightweight battery designed for oil vape atomizers with a traditional 510 thread connector. It has a capacity of 400mAh and offers variable voltage output,ensuring long-lasting power to keep you vaping throughout the day. The battery is controlled by a single power button and can be unlocked and locked with five consecutive clicks. It features a preheating method and a 12-senconds preheating cycle. At just 90mm in length and 11.2mm in diameter, making it suitable for compact devices and extended vape sessions. It’s easy to carry and use discreetly.