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Battery Life Calculator

Enter the required parameters, and the calculator will determine the expected battery lifetime for any battery.

Battery capacity:

Ah ▾

(Device consumption):

Discharge safety:

mA ▾

(Awake time):

sec ▾

Sleep time

Battery life:

mA ▾

(Average consumption):

sec ▾

Related

Get an accurate estimate of battery life with this free battery life calculator. This online tool is designed to calculate average consumption and battery runtime efficiently.

What Is The Purpose of Battery Life?

Battery life refers to the period during which a battery continues to function before it needs recharging. It represents the lifespan of the battery until it must be replaced or recharged. Several factors affect battery life, including moisture, high temperature, dirt, vibration, and more.

Terms in Battery Run Time Calculation

Whether calculating battery life manually or using a battery life calculator, understanding the following key terms ensures accurate results:

Capacity:

The total charge the battery can store, measured in ampere-hours (Ah). Usually printed on the battery.

Consumption:

The average current in amperes drawn by the electronic devices connected to the battery.

Discharge Safety:

The percentage of the battery capacity that should never be used to prevent deep discharge and damage.

Battery Life Formula:

To calculate battery life manually:

Battery Life = Capacity / Consumption × (1 - Discharge Safety)

Why Sleep Mode Drains Battery?

Even in sleep mode, devices remain ON and consume battery power, though less than during active usage. To calculate average consumption considering both awake and sleep time:

Average Consumption = (Consumption1 × Time1 + Consumption2 × Time2) / (Time1 + Time2)

Awake Time:

The duration the device remains active during a single operational cycle of the battery.

Consumption in Sleep Mode:

The current in amperes that the device consumes while in sleep mode.

Sleep Time:

The time the device spends in sleep mode during a single operational cycle.

Why Calculate Battery Life?

Estimating battery life based on device consumption is essential in designing and using circuits. You can calculate it manually using the formulas above or use an online battery life calculator for quick results.

How to Calculate Battery Life?

Determine the battery capacity by checking the battery label or using a battery capacity calculator.
Determine the average consumption of the electronic device.
Assume a discharge safety factor (commonly 20%).
Plug these values into the battery life formula to calculate estimated runtime.

If manual calculation seems difficult, a battery runtime calculator can provide results instantly.

Working of Our Battery Calculator

Inputs:

Enter values for battery capacity, device consumption, discharge safety, awake time, and sleep time.
Click the Calculate button.

Outputs:

Average Consumption
Battery Life in Hours
Battery Life in Other Units
Average Consumption in Other Units

Rechargeable Batteries Properties Table

Battery runtime depends on characteristics such as type, electrolyte, voltage, energy density, and life cycles:

Type of Battery	Electrolyte	Operating Temperature (°C)	Open Cell Voltage (V)	Energy Density (Wh/kg)		Charge / Discharge Efficiency (%)	Power Densities		Life Cycles
Type of Battery	Electrolyte	Operating Temperature (°C)	Open Cell Voltage (V)	Theoretical	Achievable	Charge / Discharge Efficiency (%)	Peak (W/kg)	Sustained (W/kg)	Life Cycles
Lead-Acid	H₂SO₄	-20 - 60	2.1-2.2	171	30-40	70-90	120	25	200-2000
Nickel-Iron	KOH	20 - 30	1.2	267	60	65			2000
Lithium Ion	LiPF₆	-20 - 60	3.6		100-200	70	720	360	500-2000

FAQs

How Long Does a 5000mAh Battery Last?

Modern smartphones with a 5000 mAh battery can last up to two days under basic usage. Playing videos, music, or running heavy apps will reduce battery life depending on usage.