How to Use the Battery Runtime Estimator
- Enter your battery capacity. Type in the watt-hour (Wh) rating of your battery. If your battery is rated in volts (V) and milliamp-hours (mAh), convert using:
Wh = (V × mAh) ÷ 1000
- Enter your device’s power consumption. Input the watt draw (W) of your camera, light, monitor, or accessory.
- (Optional) Add multiple devices if you’re powering several items from one battery (e.g., camera + monitor + wireless system).
- Click Calculate. The tool will show you:
- Estimated runtime in hours and minutes.
- Runtime per device (if multiple inputs).
- Comparison to other common battery sizes.
- Use this result to plan how many batteries you’ll need for your shoot and whether you’ll require external power solutions (V-mount, Gold mount, D-Tap, or AC).
Tip: Always budget extra capacity — actual runtimes are often 10–20% shorter due to efficiency losses and power spikes. Keep at least one spare battery charged and ready.
Battery Runtime Estimator
Results
About the math
Capacity(Wh): if entered in mAh, Wh = (mAh × V) / 1000.
Total Wh scales with number of packs (series or parallel).
Usable Wh = TotalWh × (efficiency%) × (1 − reserve%).
Runtime (hours) ≈ UsableWh ÷ LoadWatts.
If you enter current: LoadWatts = I × Vout.
Estimating Battery Runtime for Cameras & Film Equipment
Power management is one of the most important — and often underestimated — parts of professional photography and cinematography. Whether you’re shooting with a mirrorless camera, running a cinema rig with multiple accessories, or powering LED lighting fixtures, knowing how long your batteries will last is critical to avoiding downtime on set.
The Battery Runtime Estimator helps you calculate exactly how much operating time you can expect from a given battery. By entering the battery’s watt-hour (Wh) rating and your device’s power draw (W), the calculator shows the expected runtime in hours and minutes. This is invaluable for planning shoots, budgeting batteries, and ensuring you won’t lose power during critical moments.
For example, if you’re using a 98Wh V-Mount battery to power a camera drawing 25 watts, your runtime will be roughly 3.9 hours. If that same battery is also powering a 7W monitor and a 10W wireless video system, the total draw rises to 42W, reducing runtime to around 2.3 hours. This makes it easy to plan exactly how many batteries you’ll need for a day of shooting.
This tool is especially useful for:
- Cinematographers and camera operators running full rig setups.
- Photographers estimating shoot time on-location without AC power.
- Gaffers and lighting technicians managing LED panels and tube lights on portable batteries.
- Drone pilots and field videographers maximizing limited flight or recording time.
Keep in mind that real-world runtimes are often shorter than the math suggests. Efficiency losses, voltage drops, and sudden power spikes can reduce usable capacity by 10–20%. That’s why professionals always carry extra batteries and hot-swap solutions.
By using the Battery Runtime Estimator, you’ll gain confidence in your power workflow, reduce guesswork, and avoid unexpected shutdowns. Whether you’re shooting a commercial, a wedding, or an outdoor documentary, this tool helps ensure your gear stays powered as long as you need it.