The Medical Non-Implantable Batteries segmentation by Type is anchored in four chemistries that differ in energy density, cost, and lifecycle, shaping procurement decisions across facilities. Lithium-ion dominates value share (>45%) because its 3.6 V nominal output and 200–250 Wh kg⁻¹ density permit miniaturization of high-drain devices such as portable ultrasound and ventilators, offsetting a 30-40% price premium over nickel chemistries. Lithium primary (coin, cylindrical) commands the largest volume share in the market taxonomy; its 10-year shelf life and stable voltage make it the default for emergency defibrillators and blood-analyzer backup circuits, generating predictable replacement demand. Nickel–metal hydride offers a rechargeable, lower-cost bridge for ward-grade pulse oximeters where weight is less critical, yet its 1.2 V cell and memory effect constrain adoption to mid-tier products. Nickel–cadmium, though legacy, persists in developing regions for suction pumps because of robust temperature tolerance and low upfront cost, but its 20% cadmium content is accelerating substitution under RoHS-like directives.