The IMR14500 is a rechargeable lithium-ion battery cell that is similar in size to a standard AA (14 mm diameter × 50 mm length) but operates at a higher voltage and capacity. Unlike traditional alkaline AA batteries (1.5V) or NiMH rechargeables (1.2V), the IMR14500 typically delivers 3.6V–3.7V nominal voltage and can reach up to 4.2V when fully charged. The “IMR” designation indicates the use of lithium manganese oxide chemistry, known for high discharge rates, safety, and thermal stability, making these cells popular in flashlights, vaping devices, and compact electronics requiring higher power.