How many times can a Power Bank charge my device

At Cable Chick, we use an icon system to indicate how many device charges External battery power you're likely to get out of a Power Bank before it needs to be recharged. Our figures are based on a formula which assumes an average device capacity of 1500mAh, a device power level of no less than 20%, and an 80% Power Bank efficiency rating. Many Power Banks boast efficiency ratings up to and over 90%, but we find that real-world usage in Australian climates typically ends up with an 80% efficiency rate.

We also like to err on the side of caution to give you a conservative estimate rather than make outrageous claims. Generally, the bigger the Power Bank and the smaller the device you're charging, the more goes you get. Other factors can also improve or limit the discharge potential of a Power Bank, so look after them and they'll work better for longer.

Our Formula:
Power Bank Rating (mAh) × Efficiency × Device Depletion ÷ Device Capacity (mAh)

Example:
6000 × 0.8 × 0.8 ÷ 1500 = 2.5 charges (approximately)

Look for our handy icons to immediately see the charging potential of our power banks for use with smartphones, or use this formula yourself to calculate the number of charges any device could get. All you need to know is the mAh rating of its battery!