All of this determines how long the battery will last between charges. If you are a long toker or use lower ohm coils.. it won't last as long. Vendors generally say a 650mah battery will last 4-6 hours but it might be a lot more..
Accordingly, how many hours does a 1500 mAh battery last?
If you divide this current into the capacity, 2750/25, you get the number of hours that the battery can sustain it: 110. If the load is 500mA, the cell's usable capacity actually drops to approximately 1500 mAh, and 1500/500 is only 3 hours. Devices like remote controls do not use continuous power.
How many hours does a 2000mah battery last?
For a battery, its the total charge available. For a 2000 mAH battery you can pull 100 mA for 20 hours or 1000 mA for 2 hour. For a phone, mAH is the measure of how much power is used over a period of time. If it uses a steady 100 mA for 20 hours, it is said to have used 2000 mAH.