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Filmmaking Dictionary: Number 9 / 98Wh Battery
Definition
A 98Wh battery stores a nominal ninety-eight watt-hours of electrical energy. Watt-hours describe capacity, not instantaneous power. The rating is common on compact professional camera batteries, including products using V-mount or Gold Mount interfaces.
The energy rating does not establish voltage, maximum current, connector compatibility or charging requirements. Two batteries marked 98Wh may support different equipment and output limits. Read the complete specification before treating them as interchangeable.
Estimating Runtime
A basic estimate is runtime in hours = battery energy in watt-hours ÷ total load in watts. A 98Wh battery powering a steady 49W load gives an ideal calculation of two hours.
Real operation can be shorter because of conversion losses, temperature, battery age, protection thresholds and changing equipment demand. Include the camera, monitor, wireless transmitter, lens motors and other accessories powered from the same battery. Capacity estimates should leave room for the actual shooting conditions.
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Capacity Is Not Maximum Output
- Watt-hours describe how much energy the battery nominally stores.
- Watts describe the rate at which connected equipment uses energy.
- Amps describe current, which must remain within each relevant output’s rating.
- Voltage must match the equipment or an approved power-conversion arrangement.
A battery may have enough stored energy for a light but still be unable to supply its required power. Maximum continuous output, individual port limits and the equipment’s startup behaviour matter independently of runtime.
Travel Considerations
The 98Wh size sits below a commonly used 100Wh air-travel threshold for lithium-ion batteries. That is one reason it appears in travel-oriented camera kits, but the label is not blanket permission for every airline, route or packing arrangement.
For example, US FAA passenger guidance requires spare lithium batteries in carry-on baggage with protection against short circuits. Airlines can impose additional limits. Check the actual carrier’s current requirements, keep capacity markings readable and protect terminals from contact with conductive items.
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Frequently Asked Questions
Is 98Wh the same as 98 watts?
No. A 98W load would consume 98Wh in one ideal hour; usable runtime depends on the real system.
Can watt-hours be calculated from amp-hours?
Yes. Multiply nominal voltage by amp-hours. For example, 14.4V × 6.8Ah is approximately 98Wh. Divide milliamp-hours by 1,000 first.
Related Terms
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