With their unique advantages of high energy density, thinness, and flexible form factors, lithium polymer (LiPo) batteries have widely permeated every corner of modern life. In consumer electronics, they allow devices to be designed slimmer with longer battery life; in RC hobbies, they deliver the massive burst currents required for racing cars and FPV drones; and in broader industrial and commercial scenarios—from portable medical devices and emergency backup power stations to agricultural irrigation drones and urban security patrol robots—lithium polymer batteries play an irreplaceable role as the primary power core. Battery capacity directly determines a device’s runtime and operational stability, making it a critical parameter for user selection as well as for battery manufacturers designing and customizing lithium battery packs.
What is the capacity of a lithium polymer battery? The capacity of a lithium polymer battery is essentially the amount of electrical charge it can store. It is the core metric for measuring a battery’s energy storage capability and directly determines the operating time of a device on a single charge. The universal industry units of measurement are milliampere-hours (mAh) and ampere-hours (Ah), with the conversion standard of 1 Ah = 1000 mAh. Put simply, battery capacity represents how long it can continuously output a fixed current. Taking a polymer lithium battery with a capacity of 1000 mAh as an example, it can theoretically output a continuous current of 1000 mA for 1 hour, 500 mA for 2 hours, or 100 mA for 10 hours. Under the condition of constant device power consumption, a larger mAh value means more stored energy and longer battery life, which is precisely the core advantage of high-capacity lithium polymer batteries. How to calculate lithium polymer battery capacity? Calculating the capacity of a LiPo battery involves understanding its discharge rate and its power supply duration. The basic formula for calculating capacity is: Capacity (mAh) = Current (mA) × Time (hours) For example, if a battery can provide 1000 mA continuously for 2 hours, its capacity would be: 1000 mA × 2 hours = 2000 mAh