Most modern Makita batteries like Makita 18V battery rely on lithium-ion chemistry. Lithium-ion cells offer higher energy density than older nickel-cadmium or nickel-metal hydride packs. This means lighter packs with more runtime. A standard Makita pack uses cylindrical cells arranged in series and parallel connections. https://usabatteries.com/produ....ct/2-pack-makita-18v