Battery Life Estimator

How to calculate battery life?

Battery life is estimated by dividing the total capacity by the hourly power consumption of all active components.

Formula: Runtime (h) = Capacity (mAh) / Average Drain (mA)

Using the Battery Life Estimator: an example

Example: A smartphone with a 5000mAh battery used for light browsing with medium brightness.

Step-by-step calculation:

• Identify base drain (e.g., 250mA for smartphones)
• Add screen drain (e.g., +100mA for 60% brightness)
• Divide 5000mAh / 350mA total drain
• Result: ~14.2 hours of runtime

Frequently Asked Questions

Does Dark Mode actually save battery?

Yes, on OLED screens, Dark Mode can reduce power consumption by up to 30% because black pixels are completely powered off.

Why does battery life drop faster below 20%?

Voltage drops as the battery depletes, often causing the device to work harder to maintain power, though some of this is also due to software reporting inaccuracies.