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The O.pen Vape 2.0 Variable Voltage Battery is a great 510 threaded battery that comes complete with 4 different voltage settings to help suit your mood and material. Being 510 threaded this battery is compatible with many vape pens so you can customize your vape pen to be unique. Charging the battery is done by screwing it into the included USB charger and plugging it into a USB port or charger. You can even activate a rapid charging mode by swiping your finger across the logo so you can continue vaping even quicker than before!