How to Calculate Battery Run Time

The Battery Run Time Calculator determines the run time based on battery capacity, voltage, and device power consumption. The formula is:

Where:

• \( RT \): Run Time (in hours).
• \( C \): Battery Capacity (in Ah; convert mAh to Ah by dividing by 1000).
• \( V \): Battery Voltage (in V; convert mV to V by dividing by 1000).
• \( P \): Device Power Consumption (in W; if in A, convert to W using \( P = V \times A \)).

Enter values and select units to calculate. Result is displayed in hours and minutes.

Formula source: General electrical engineering principles.

Using the Battery Run Time Calculator

This calculator is useful for estimating how long a battery will last powering a device.

Input battery capacity (with unit), voltage (with unit), power consumption (with unit). The calculator handles conversions and computes the run time in hours and minutes.

Example: For 12V battery, capacity of 6 Ah, power consumption of 24W:

1. Battery Voltage: \( 12 \, \text{V} \)
2. Battery Capacity: \( 6 \, \text{Ah} \)
3. Device Power Consumption: \( 24 \, \text{W} \)
4. Run Time: \( \frac{6 \times 12}{24} = 3 \, \text{hours} \)
5. Result: 3 hours 0 minutes

Another example: Capacity 6000 mAh, Voltage 12000 mV, Power 2A:

1. Capacity: \( 6000 \, \text{mAh} = 6 \, \text{Ah} \)
2. Voltage: \( 12000 \, \text{mV} = 12 \, \text{V} \)
3. Power: \( 2 \, \text{A} \times 12 \, \text{V} = 24 \, \text{W} \)
4. Run Time: \( \frac{6 \times 12}{24} = 3 \, \text{hours} \)
5. Result: 3 hours 0 minutes

Use this tool for accurate battery run time estimations.

Common FAQ

Below are frequently asked questions about Battery Run Time calculations:

• Q: What is Battery Capacity?
  A: The amount of charge the battery can hold, in Ah or mAh (1 Ah = 1000 mAh).
• Q: What if voltage is in millivolts?
  A: Select mV unit; it will be converted to V automatically.
• Q: What if power is given in Amperes?
  A: It is converted to Watts using the battery voltage.
• Q: Does this account for efficiency?
  A: No, this assumes 100% efficiency; real-world may be lower due to losses.
• Q: Can negative values be used?
  A: No, all inputs must be positive; invalid inputs leave the result blank.
• Q: How accurate is this?
  A: It's an estimate; factors like temperature and battery age affect actual run time.