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How Many Times Can My Power Bank Recharge a Phone?
publisherRickey
time2017/11/13
- how many times will your power bank charge an external device? But how are these numbers created? Today, we will explore the formula behind charge performance in power banks so that you’re armed with the best possible knowledge base when buying a new product.
How Many Times Can My Power Bank Recharge a Phone?
The Math
While math may not be the most exciting subject in school (rocket ship designers might disagree), it’s important to understand how exactly a manufacturer calculates the number of times their power bank will charge your cellphone. Here’s the formula they rely on:
Labeled capacity of the power bank x 3.7 / output voltage of power bank x 0.85 / battery capacity of device = Total number of recharges
Using the above formula we can expect 7.7 recharges of the iPhone 8 from a power bank with a 16000mAh capacity.
16000 x 3.7 / 5 x 0.85 / 1821 = 7.7 charges
For the Samsung Galaxy S8, we can do the same calculation for its 3000mAh battery:
16000 x 3.7 / 5 x 0.85 / 3000 = 4.6 charges
ARUN F1plus Product details
Model:F1PLUS Type-c Input:DC 5.0V/2.0A
Material:Aluminum alloy Type-c Input:DC 5.0V/2.4A
Size:165*61*23 QC Output:5V/3A,9V/1.67A,12V/1.25A
Color:Red Nomal Output:DC5.0V/2.4A
Capacity:10000mAh Input:DC5.0V/2.0A
Battery type:Li-ion Weight:231.5g
The Details
Okay, so we’ve given you a formula, but what does it all mean? Let’s start with the first multiplication number – 3.7. This is the average voltage that you find in a battery cell.
How about the next one – 5? We use this here as the average voltage output of a typical power bank.
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