Lamb was also concerned the fire danger was greatest when the tools were plugged into rechargers. Buyers are urged to contact Energy Safety.
"Clearly there's safety issues, there's Fair Trading Act issues, intellectual property issues and fraud," Lamb said.
The Commerce Commission, manufacturers and police had been informed.
Hitachi's local distributor, Andrew Day, said he was beginning to prepare a civil case against one trader. He said consumers should buy from authorised dealers. "It's one thing to buy parallel imported shoes or perfume but when you're talking about electrical tools, it's different," he said.
Last week, the Herald on Sunday revealed a number of electrical products for sale on Trade Me were not safe for use in New Zealand.
Trade Me trust and safety manager Jon Duffy said the website monitored listings and removed up to 350 illegal electrical products a month.
The unnamed banned trader had hired high-profile law firm Simpson Grierson, which released a statement: "We are an Auckland-based company that specialises in supplying hardwares and related accessories. Until recently we had operated a well-established business via Trade Me with an average of 600 listings a week. We strive to ensure compliance with the law.
"Energy Safety has recently advised us that they consider the documents for electrical chargers that we supply are not correct. As a result, Trade Me has suspended our account.
"We decided to instruct lawyers to help us navigate applicable New Zealand laws and address issues raised."