Ispire Ducore Palm 400mAh Starter Kit Designed to perfectly fit with the 13.5 mm Ducore™ Cartridge, this 400 mAh In-Palm battery is a compact, ergonomically designed battery to fit comfortably in your hand—a great combo kit. Ispire Ducore Palm Starter Kit Specifications Size: 35.4 x 55.9 x 20.4 mm Battery: 400 battery Voltage Output: 2.9V / 3.3V / 3.6V Package Contents 1x Battery 1x Cartridge 1x USB Cable 1x 510 Connector 1x User Manual