an electric heat sealer for sealing workpieces such as plastic bags or the like includes a casing defining a battery chamber , a press bar pivotally connected to the casing , a sealing mechanism supported on a compression spring in a spring holder inside the casing , and a safety device . the sealing mechanism is electrically connected to produce heat for sealing the workpiece being put thereon when the press bar pressed against the sealing mechanism . the safety device breaks the electrical circuit when the apparatus is not in use .