Milwaukee Electric Tool Corp. has been issued a U.S. patent on its new lithium-ion batteries for its line of cordless power tools.

The battery packs are capable of discharging more than 20 amps of power, Milwaukee officials said. The batteries are used in the company’s new M12 and M18 product lines, as well as the V28 and V18 models.

The batteries are the result of years of research and millions of dollars worth of investments in the technology, company officials said.

“This patent, along with other patents already issued to Milwaukee in the lithium-ion field provide broad, valuable rights to Milwaukee in the use of lithium-ion batteries in power tools,” said Steven Richman, President of Milwaukee Electric Tool Corp. “The granting of this milestone patent confirms the long-stated position of Milwaukee as having revolutionized the power tool industry as the leader in lithium-ion technology for power tools.”