How Long Will A 2000 Mah Battery Last. For example AA alkaline batteries typically have a capacity rating of over 2500 mAh and AA NiMH batteries have rated capacities of only 1200 to 2000 mAh. So a 20000mAh power bank can theoretically charge an iPhone 6 plus from 1-100 69 times 20000 2915 69.
It is based on how long a battery will last when power is drawn constantly eg. A 3000 mAh battery will last 3 times more that a 1000 mAh battery in the same circuitapplication. Its 2000mAh100mA 20 Hours.
So really its up to you your battery and your budget.
This battery life calculator estimates how long a battery will last based on nominal battery capacity and the average current that a load is drawing from it. While in use no more than 4 hours. Similarly a 2000mAh battery will give you 2000mA 2A for one hour or 1000mA 1A for two hours. So really its up to you your battery and your budget.
