Battery runtime calculator
Plan batteries for a shooting day. Enter the battery capacity in watt-hours and the total power draw of the rig; the calculator gives the runtime of one battery and how many batteries a day of shooting needs. It also shows the air travel category for that battery size.
If the battery lists only mAh, enter mAh and voltage and the watt-hours are calculated for you.
How to use it
- Battery capacity: in Wh, as printed on the battery, or from mAh and voltage.
- Power draw: the camera plus monitor, wireless video, focus motors and other accessories, in watts.
- Shooting hours: for the number of batteries.
Example
A 98 Wh battery on a rig drawing 60 W runs about 1 hour 38 minutes. A 10-hour day needs 7 batteries. At 98 Wh the battery can travel in carry-on baggage without airline approval.
Good to know
Runtime is nominal; batteries usually deliver 80–90 % of their rating, less in the cold. Air travel limits follow the IATA rules for spare lithium-ion batteries: up to 100 Wh allowed in carry-on, 100–160 Wh with airline approval and at most two spares, over 160 Wh not allowed. Airlines can be stricter.