How Many Times Can a 5000mAh Rated Power Bank Charge a Phone?

How many times can a 5000mAh rated power bank charge a phone? It depends on a few factors that we will discuss in this article!

How Many Times Can a 5000mAh Rated Power Bank Charge a Phone?
How many times can a 5000mAh rated power bank charge a phone

The Brick power bank is 5000 mAh, which is the unit of charge, not the unit of energy. Two electronic gadgets with lithium-ion batteries can have the same battery mAh, but their energy levels can vary.

Factors affecting the charging efficiency

Several factors affect the charging efficiency of a power bank, including various efficiency factors related to the battery itself and the quality of the device being charged

The charging efficiency

The charging efficiency is a measure of how effectively the energy is transferred from the power bank to the phone battery during the charging process. It is determined by the ratio between the energy consumed by the charging process and the energy actually stored in the phone battery.

How does the cable length affect charging efficiency?

Cable length can have an impact on charging efficiency, but in the case of power banks like Brick, it is not a significant factor. Voltage drop, which affects charging efficiency, typically occurs over longer cable lengths, usually around 15 meters or more. The cable efficiency of Brick power banks is 100%

What is the chemical efficiency of a battery cell?

Rechargeable lithium-ion batteries undergo degradation over time, which can be influenced by various factors, including usage patterns and environmental conditions. One such factor is temperature, as extreme temperatures can harm battery performance and lifespan.

Speaking of temperatures, being headquartered in Sweden, where it can get pretty chilly, we've had our fair share of experiences with low temperatures!

Calculating how many times a 5000mAh-rated power bank can charge a phone

Let’s make some assumptions to make our calculation more precise:

  • An iPhone 12’s battery is a 3.7 V (nominal) 2815 mAh lithium-ion cell
  • The Brick 5000mAh power bank’s cell is 3.7V
  • The boosting efficiency of the power bank is 85% (output)
  • The charging efficiency of the iPhone 12 is 85% (input)
  • Cable efficiency is 100% (Brick’s cables are shorter than 15cm)
  • The chemical efficiency of the battery cell charging is approximately 100%

To get the result, we calculate the energy of each battery, divide it by the efficient energy of Brick's power bank, and multiply it by the efficiency coefficient.

  • Brick’s power bank energy: 5000mAh *3.7V = 18.5 Watt-hours
  • iPhone battery cell energy: 2815mAh * 3.7V = 10.4 Watt-hours
  • Efficient coefficient: input * output => 0.85*0.85 = 0.7225
  • Charges: 18.5/10.4 * 0.7225 = ~1.3 times

A Brick power bank will fully charge an iPhone 12 approximately 1.3 times.

Do you want to understand how many times a Brick power bank can charge another device? Use our Charging Capacity Calculator.

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