Battery Capacity

Battery capacity (Wh)

Check your battery label or spec sheet. Common: 16 Wh (Sony NP-FZ100), 98 Wh (V-mount)

Battery capacity (mAh)

Printed on the battery or in product specs

Nominal voltage (V)

Usually 3.6 V, 3.7 V, 7.2 V, or 7.4 V

Device Draw

Power draw (watts)

Typical: 4-8 W (mirrorless camera), 15-25 W (cinema camera), 2-5 W (field monitor)

Efficiency loss 12%

12%

Accounts for heat, voltage conversion and regulation losses

Multi-battery (Optional)

Number of batteries

Total runtime = per-battery runtime × battery count

Ctrl+Enter to calculate

Example Output

Runtime Per Battery

2:04

2 h 4 min per battery

Total Runtime

4:07

4 h 7 min with 2 batteries

Battery Capacity

16.4 Wh

Effective Capacity

14.4 Wh

After 12% efficiency loss

Device Draw

7 W

Batteries

Quick Scenarios

Draw	Per Battery	Total
5 W	2:53	5:46
10 W	1:27	2:53
20 W	0:43	1:26
40 W	0:22	0:43

Example: Sony NP-FZ100 (16.4 Wh) powering a mirrorless camera at 7 W with 12% efficiency loss and 2 batteries. Enter your own values and click Calculate to see your personalised result.

Runtime Per Battery

--:--

Battery Capacity

Effective Capacity

Device Draw

Batteries

Quick Scenarios

Draw	Per Battery	Total

Note: Real-world runtime varies with ambient temperature, screen brightness, recording resolution, stabilisation, autofocus usage and battery age. Treat these figures as estimates, not guarantees.

How to Use

Step 1

Enter battery capacity

If you know the Wh rating, enter it directly. Otherwise, switch to "mAh + Voltage" and enter both values from your battery label. The calculator converts automatically.

Step 2

Set power draw

Enter how many watts your device uses. Check your camera specs or manual. Adjust the efficiency slider to account for real-world losses from heat and voltage conversion.

Step 3

Read your runtime

Hit Calculate to see per-battery and total runtime. The quick scenarios table shows how runtime changes at different power draws so you can plan accordingly.

Battery Runtime Calculator

How to Use

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