Battery-powered Electric Razors
Since at least the mid-1960s, battery operated electric razors have been available using rechargeable batteries sealed inside the razor's case, previously nickel cadmium or more recently nickel metal hydride. Some modern shavers use Lithium-ion batteries that do not suffer from memory effect. Sealed battery shavers either have built-in or external charging devices. Some shavers may be designed to plug directly into a wall outlet with a swing out or pop-up plug, or have a detachable AC cord. Other shavers have recharging base units which plug into an AC outlet, which provide DC power at the base contacts (eliminating the need for the AC to DC converter to be inside the razor, reducing the risk of electric shock).
Some models, generally marketed as "travel razors" (or "travel shavers"), use removable rechargeable or disposable batteries, usually size AA or AAA. This offers the option of purchasing batteries while traveling instead of carrying a charging device.
Wet/dry razors, designed to allow use with soap and water, are exclusively of the battery-operated type (for electrical safety).
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