Battery Life Calculator

Precision battery analysis with advanced parameters

V
90%
°C
80%

Consumer Electronics

Flagship Phone

4500-5000 mAh

Mid-Range Phone

3500-4500 mAh

Tablet

7000-10000 mAh

Ultrabook

50-60 Wh

Gaming Laptop

80-90 Wh

Smartwatch

300-500 mAh

Power & Industrial

Small Power Bank

5000-10000 mAh

Large Power Bank

20000-30000 mAh

Home UPS

7-12 Ah (12V)

Solar Battery

100-200 Ah (12V)

RV Battery

200-300 Ah (12V)

Photography & Drones

DSLR Camera

1200-2000 mAh

Mirrorless

1000-1500 mAh

Prosumer Drone

3500-6000 mAh

Professional Drone

6000-10000 mAh

Select a device

Capacity
Voltage
Typical Draw
Chemistry

Battery 1

V

Battery 2

V

Comparison Results

Battery 1
Battery 2
Runtime Difference
Energy Difference

Estimated Runtime

hours
0%
Total Energy — Wh
Power Usage — W
System Voltage — V
Efficiency –%
Temperature –°C
Depth of Discharge –%
Technical Notes

Calculations account for system efficiency and depth of discharge. Actual runtime may vary based on usage patterns and environmental conditions.

Chemistry:

Saved Calculations

No saved calculations yet

✅ What Is a Battery Life Calculator?

The Battery Life Calculator is an online tool you can use to estimate how long a battery will last based on the capacity of the battery (in mAh or Ah) and the power consumption of the device (in milliamps or Watts).

It’s widely used in:

  • Electronics troubleshooting
  • Renewable energy planning (solar setups)
  • DIY electronics projects
  • Power bank comparisons
  • Off-grid camping and survival gear checks

🔧 How Does the Battery Life Calculator Work?

The principle of the calculator is to apply a simple, but very effective formula:

Battery Life (hours) = Battery Capacity (mAh or Ah) / Device Consumption (mA or A)

For example:

A 10,000 mAh power bank running a device that consumes 500 mA will last about 20 hours.

And advanced calculators also allow you to factor in:

  • Voltage (V)
  • Device load variability
  • Efficiency percentage
  • Parallel or series battery configuration

At AllTools. Co we’ll get all of these fields for real life accuracy.

🎯 Key Inputs in the Battery Life Calculator

InputDescription
Battery CapacityMeasured in mAh (milliamp hours) or Ah
Device Power UsageIn mA (milliamps), A (amps), or watts
Battery VoltageTypically 3.7V, 5V, 9V, or 12V
Efficiency (%)Accounts for power losses during usage
Discharge RateOptional: Defines how quickly power is drawn

🧠 Shall We Use a Battery Life Calculator?

A battery life calculator is practical and economical for all types of professionals, and even uses the tool below for hobbyists to help plan out their power usage.

💡 Benefits:

  • Plan for Accuracy: No more inconvenient power cutoffs during projects or events.
  • Save Money: Purchase only the batteries you need; no more, no less.
  • Device Protection: Protect the battery from over-discharge and prolong life.
  • Eco-Friendly: Maximize energy usage and minimize waste.
  • EASE: Find easy results without any manual math or guesswork

🔋 Real-World Use Cases: Here’s how various types of users benefit from the tool:

🧰 For Engineers & Technicians: Aids in circuit design and selecting an IoT and embedded hardware power solution.

🌿 For Outdoor Enthusiasts: Camping trips, but also instead of losing your GPS or headlamps, chips just work to death inexorably, and mid-hike.

💼 For Business Travelers: Guess how long your power bank will last along with your laptop or phone while in transit.

🏠 For Homeowners: Determine how long you want your emergency lights or UPS systems to operate during a blackout.

🧮 Try Our Battery Life Calculator: Simple, Smart, Fast

On AllTools. co, we’ve put together a simple form that takes less than 30 seconds to fill out! It supports:

  • Both basic and advanced calculation modes
  • Mobile and desktop compatibility
  • Real-time auto-updating results as you type

And it’s free — no downloads, no logins.

🔍 Related Tools on AllTools.co

To get even more accurate with your planning, try:

📌 Final Thoughts

A Battery Life Calculator is not only convenient, but it is also a very powerful decision-making tool. Whether you are building hardware, preparing for a trip, or working on an emergency backup power estimate, you’ll save time, energy, and money.

AllTools Co. provides you with free, accurate power tools at your fingertips. Give our calculator a go right now and cease all guessing.

Read our guideline about finance , credit card and more, click button below.

🙋‍♂️ Questions on Battery Life Calculators

❓ Can I use the calculator for rechargeable batteries?

Yes! The calculator applies to Li-ion, NiMH, alkaline, and lead-acid batteries.

❓ Does it work for solar systems?

Absolutely. Simply input the battery size and load draw of your solar devices.

❓ Can I calculate battery runtime for laptops or phones?

Yes, if you provide information about power draw (in watts) and battery details, the calculator will give a good estimate of runtime.

❓ Is this tool free?

Yes! AllTools is all free and available without sign-ups or hidden charges 100%.

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