The battery’s timing is in a directly proportional relationship with the mAh of it. The higher the mAh of the battery the longer will it last and longer will be the time taken to charge it. Also, the bigger will be the size of it. With that being said, most 900 mAh batteries are good for roughly 800 puffs, 650 mAh batteries for 400 puffs, and 1100 mAh batteries for 1,000 puffs. Once again, those numbers are general estimations that can vary from manufacturer to manufacturer as much as from user to user. And mostly these batteries have the capacity to be charged 200 to 300 times. For example, the iTaste VV3.0 battery is engineered for charging 250-300 times and can last up to two days on a full charge; with these variables, a user can expect up to two years of service from the 800 mAh battery. There are some other factors as well that affect the life of the battery. So buy now at the U.K Vaper Store. .  We are bringing you guys the best possible vape batteries U.K of power outages of 18650 and 26650.