🔋 Understanding how long your battery will last is essential if you’re powering an IoT device, off-grid system, or just a flashlight.
A battery run time calculator simplifies this process by helping you estimate how long a device can operate based on the battery capacity and power consumption.
In this guide, we’ll explain how battery runtime is calculated, include an interactive calculator, and provide tips to optimize battery life.
Table of Contents
🧮 Battery Runtime Formula
Battery runtime is calculated using the following formula:
Battery Runtime (in hours) = Battery Capacity (Wh) ÷ Device Power Consumption (W)
If your battery is rated in amp-hours (Ah), convert it to watt-hours (Wh) using:
Battery Capacity (Wh) = Battery Capacity (Ah) × Battery Voltage (V)
✏️ Example: Battery Runtime Calculation
Let’s break it down with a real-world example:
You have:
- 🔋 Battery Capacity: 10 Ah
- ⚡ Battery Voltage: 12 V
- 💡 Device Power Consumption: 24 W
Step 1: Convert Amp-Hours to Watt-Hours
Watt-Hours (Wh) = 10 Ah × 12 V = 120 WhStep 2: Calculate Runtime
Runtime = 120 Wh ÷ 24 W = 5 hours✅ Result: The device will run for approximately 5 hours.
✨ Tips to Maximize Battery Runtime
💤 Use Low-Power Modes
Many devices offer power-saving or sleep modes. Use them strategically.
💡 Reduce Power Consumption
Turn off LEDs, dim screens, and disconnect unused peripherals.
🔄 Choose Efficient Components
Use microcontrollers and components optimized for low power.
🔋 Use Higher Capacity Batteries
When feasible, choose batteries with higher mAh or Wh ratings.
🧾 Summary
When you’re powering an IoT sensor, portable tool, or backup system, calculating battery runtime helps plan your usage and avoid surprises. Use our calculator to get instant estimates and optimize your energy use.