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Battery Life Calculator


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Battery life calculator helps you calculate how many hours your device’s battery will run before it needs to be recharged. It considers some factors during calculations such as battery capacity and device power consumption. This way, you can better plan your usage and choose the right battery that aligns with your specific needs and preferences.

What does battery life mean?

Battery life refers to the amount of time a battery can run before it needs to be recharged.

 This is typically measured in hours or minutes and can vary based on various factors, such as:

  • Device Usage: The more intensive the use of features like gaming or video streaming, the quicker the battery drains.
  • Screen Brightness: Higher brightness settings typically consume more power.
  • Background Apps: Running multiple apps simultaneously can increase power consumption.
  • Temperature: Extreme temperatures, both high and low can impact the battery performance.
  • Network Connectivity: Using Wi-Fi or mobile data continuously can impact battery life.
  • Charging Habits: Frequent or partial charges can contribute to a shorter overall battery lifespan.
  • Battery Health: The age and overall battery’s health impact its capacity over time.

Considering and managing these factors can help users maximize the battery life of their devices and ensure optimal performance over time.

Battery life formula:

To calculate the battery life simply divide the battery capacity by the power consumption of the device and a safety factor accounting for discharge efficiency

The formula to estimate battery life can be simplified as:

$$ Battery\ life = \frac{Capacity}{Consumption \times (1 - Discharge\ safety)} $$

In this equation,

  • Capacity – The total energy a battery can store, usually measured in ampere-hours (Ah) or watt-hours (Wh).
  • Consumption –How much power a device uses during the operation, measured in watts (W).
  • Discharge safety – A factor representing the safety margin in discharging the battery, often expressed as a percentage. It helps prevent over-discharging, which can be harmful to the battery.

You can easily find out how long a battery will last using the formula mentioned above.


Let's say we have the following values for a device:

  • Battery Capacity: 2000 mAh
  • Power Consumption: 100 mA
  • Discharge Safety: 10% (0.10)

Now, let's add these values into the formula:

\(Battery\ life = \frac{2000}{100 \times (1 - 0.10)}\)

First, calculate the value inside the parentheses:

\(1 - 0.10 = 0.90\)

Now add this value to the equation:

\(Battery\ life = \frac{2000}{100 \times 0.90}\)

Now, let’s do the calculations:

\(Battery\ life = \frac{2000}{90}\)

\(Battery\ life \approx 22.22 \ hours\)

So, the estimated battery life would be approximately 22.22 hours with the given values.

How long does a 5000mAh battery last?

A regular smartphone equipped with a 5000mAh battery can stay powered for around two days with a single charge, especially when doing simple activities such as browsing the web and checking emails. The duration it lasts depends on how the device is used, and the estimate is based on common usage scenarios.

Battery life comparison across different devices:

Device Category Device Example Battery Capacity (mAh/Wh) Low Battery Life (Hours) Moderate Battery Life (Hours) High Battery Life (Hours)
Smartphones Gaming phone (e.g., ROG Phone 6) 6000 mAh 3-4 (gaming) 6-8 (mixed use) 10+ (light use)
  Mid-range phone (e.g., Pixel 6a) 4410 mAh 4-5 7-8 10-12
  Budget phone (e.g., Redmi Note 11) 5000 mAh 5-6 8-10 12+
Laptops Ultra-thin laptop (e.g., MacBook Air) 52.5 Wh 4-5 (heavy use) 6-8 (mixed use) 9-10 (light use)
  Thin-and-light laptop (e.g., Dell XPS 13) 58 Wh 5-6 8-10 10-12
  Chromebook or basic laptop (e.g., Lenovo IdeaPad Flex 3) 42 Wh 6-7 8-10 12+
Tablets Media tablet (e.g., iPad Pro) 7640 mAh 5-6 (video streaming) 8-10 (mixed use) 12+ (reading)
  Reading tablet (e.g., Kindle Paperwhite) 1880 mAh 12-14 (reading) 16-18 20+
  E-reader (e.g., Kobo Libra 2) 1200 mAh 20+ (reading) 24-26 30+
Smartwatches Feature-rich watch (e.g., Apple Watch Series 8) 309mAh 18-24 (constant use) 24-36 (mixed use) 48+ (light use)
  Fitness tracker (e.g., Fitbit Charge 5) 111mAh 7-10 10-14 14-20
  Simple watch (e.g., Timex Weekender) 48 mAh 6-8 months N/A N/A


Alan Walker

Studies mathematics sciences, and Technology. Tech geek and a content writer. Wikipedia addict who wants to know everything. Loves traveling, nature, reading. Math and Technology have done their part, and now it's the time for us to get benefits.

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