The Flex 7 Power bank is a flexible, sustainable and powerful LedLenser power bank. Use it to effortlessly charge your smartphone, tablet, flashlight, head torch or wireless head phone while on the road. The Flex 7 works with two 18650, 3.6V Li-ion batteries. You can easily and quickly switch these batteries to make sure your power bank will always have enough power. You can charge it in approximately 240 minutes.