Lithium battery

Keep your MK tools running all day. This 2-pack of 4V 3000mAh USB lithium-ion batteries delivers reliable power compatible with MK 2114-21, 2163-21, 2112-21, and 2128-21 models. Higher capacity than the original, USB rechargeable for added convenience, and built to last. Charger included straight out of the box. More power, more runtime, less downtime.