Battery Life Calculator
Precision battery analysis with advanced parameters
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
Battery 1
Battery 2
Comparison Results
Estimated Runtime
Calculations account for system efficiency and depth of discharge. Actual runtime may vary based on usage patterns and environmental conditions.
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
Input | Description |
Battery Capacity | Measured in mAh (milliamp hours) or Ah |
Device Power Usage | In mA (milliamps), A (amps), or watts |
Battery Voltage | Typically 3.7V, 5V, 9V, or 12V |
Efficiency (%) | Accounts for power losses during usage |
Discharge Rate | Optional: 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:
- Watt to Amp Calculator
- Voltage Drop Calculator
- Power Consumption Estimator
- Solar Panel Calculator
📌 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%.