Replacement battery for use with the ROK Legend electronic cigarette. Dimensions: 10cm long x 1.7 cm diameter 3.5V stable power output Please Note: We offer a range of USB charge leads to charge your batteries & charge cases. Each one is clearly listed on the website to work with the kit or product listed. Please do not use on any other device or use other USB leads from other suppliers as voltages do vary. We advise never cover a charging battery & USB lead or leave unattended when the charge process in underway.