How many of you look at the technical information on the website and have absolutely no idea what a ’650mAh’ battery is, so you look to the blurb to find out how long it will last? After all, a battery is a battery right? Like those AA’s you have in the remote control. Well, no they aren’t and batteries are an important part of your eCloud Electronic Cigarettes. When a battery says it is 650mAh, what it is telling you is that it will put out 650milliamps per hour of energy, after that it will be drained. So the higher the mAh the longer it will last without the need for charging.