The “mAh” is an abbreviation for Milliamper-hour. It is a measurement unit used to describe the capacity or energy charge of a battery, or how long it will last before it needs to be recharged.
The higher a battery’s mAh rating, the longer you can expect to use it before having to recharge it. Generally, larger-size batteries have a higher mAh rating and last significantly longer. New e-cigarette users often confuse a battery’s mAh rating with its voltage. But, given the same voltage – standard e-cigarette voltage is 3.7 volts – a battery with a higher mAh rating does NOT deliver more power, it just lasts longer.
Here is a simple analogy to help you better understand the “mAh’ concept: Think of your electronic cigarette battery as a car tank. mAh is the size of your car tank and voltage is the quantity of gas being used to power the car. The bigger the gas tank, the longer the car will run.