How long does the shaver need to be charged?

See the instructions that came with the shaver. Most shavers take approximately 2 1⁄2 hours to fully recharge from a completely dead battery. Our shavers come with a USB charging cable so your shaver can be charged from almost any USB port, battery pack, or wall adapter that outputs 5 volts or less. DO NOT use any charging adapter that outputs more than 5 volts!