The plants are in Horsham and Tampa, Fla.
Improvements include expansions to automated production lines, humidity-controlled dry rooms, electrical testing equipment and other pieces, including ovens, resistance welders and tooling.
“We are experiencing strong demand for advanced batteries for multiple advanced weapon platforms, as well as order growth for tactical vehicles, satellites and missile defense systems,” David M. Shaffer, president and CEO, EnerSys, said in a statement.
Shaffer said the company plans to increase its aerospace and defense business.
In 2017, EnerSys signed more than $60 million in contracts to supply lithium-ion cells and batteries to multiple space agencies and equipment manufacturers. The batteries would be used in satellites and launch vehicles.
And it was awarded a three-year $71 million contract to supply one of its proprietary batteries used in combat and tactical vehicles and in generators for the U.S. military.