How to Use watt-hour in a Sentence

watt-hour

noun
  • Donut Lab claims its battery delivers 400 watt-hours per kilogram.
    — Sujita Sinha, Interesting Engineering, 23 Feb. 2026
  • This is good for a modern lithium-ion battery, but far below the company’s claimed 400 watt-hours per kilogram.
    — Sujita Sinha, Interesting Engineering, 9 June 2026
  • The Airbus battery cells provide 200 watt-hours of energy per kilogram.
    — IEEE Spectrum, 24 May 2016
  • With a pair of 12 lb 500 watt-hour battery packs, the exoskeleton can operate for over 2 hours during normal use.
    — IEEE Spectrum, 10 Dec. 2019
  • By comparison, most lithium-ion batteries today range from 200 to 300 watt-hours per kilogram.
    — Sujita Sinha, Interesting Engineering, 23 Feb. 2026
  • In the study, the team created lithium metal pouch cells that achieved an energy density of 317 watt-hours per pound (Wh/lb) at room temperature.
    — New Atlas, 7 Apr. 2026
  • Beginning May 1, Delta customers will be limited to two portable chargers, not to exceed 100 watt-hours each.
    — Kelly McCarthy, ABC News, 27 Apr. 2026
  • But there’s a difference of nearly four orders of magnitude between the roughly 14 watt-hours of a typical smartphone battery and that of a large EV.
    — IEEE Spectrum, 30 Dec. 2025
  • Southwest says spare batteries and power banks must be carried onboard, with terminals protected against short circuits and capacity capped at 100 watt-hours.
    — Aidin Vaziri, San Francisco Chronicle, 8 Apr. 2026
  • Starting April 20, the airline is limiting power banks to just one per passenger, and their capacity must not exceed 100 watt-hours.
    — Jibin Joseph, PC Magazine, 13 Apr. 2026
  • The policy also restricts the size of lithium batteries eligible for transportation on Southwest flights, to 300 watt-hours or less.
    — Zach Wichter, USA Today, 15 Sep. 2025
  • Last year, global data centers used 448 trillion watt-hours of electricity, more than all but 10 countries of the world, said the report issued Wednesday.
    — ABC News, 3 June 2026
  • The carbon itself had an energy density of 65 watt-hours per kilogram, also in line with commercial supercapacitors.
    — Perri Thaler, IEEE Spectrum, 22 Oct. 2025
  • It's powered with a 720-watt-hour battery, which Rad Power estimates will get you to over 100 km (65 miles) of range at low assist settings.
    — John Timmer, ArsTechnica, 12 Aug. 2025
  • The largest pack, however, will provide that 1,600 km (1,000 miles) of range, equating to energy usage of less than 100 watt-hours per mile.
    — IEEE Spectrum, 28 Aug. 2019
  • The prismatic cell design delivers an energy density of about 170 watt-hours per kilogram, according to internal testing.
    — Bojan Stojkovski, Interesting Engineering, 21 Mar. 2026
  • Based on the data, investigators estimated the battery’s energy density at about 298 watt-hours per kilogram.
    — Sujita Sinha, Interesting Engineering, 9 June 2026
  • In comparison, radioactive batteries generate only about 2 watt-hours per kilogram, which the Rads to Watts Program aims to address.
    — Ameya Paleja, Interesting Engineering, 9 Apr. 2026
  • Lithium-ion batteries, which are used everywhere from wearables to grid-level storage facilities, have high energy densities, storing up to 300 watt-hours (Wh) per kilogram.
    — Ameya Paleja, Interesting Engineering, 9 Apr. 2026
  • The Helios Horizon's previous lithium-ion pack delivered 260 Wh/kg (watt-hours per kilogram, a measure of how much energy a battery holds relative to its weight).
    — Omar Kardoudi june 12, New Atlas, 12 June 2026
  • Sun pointed out that the resulting batteries demonstrated a potential energy density exceeding 500 watt-hours per kilogram at the cell level, a power level that could enable electric vehicles to achieve a much longer driving range per charge.
    — Prabhat Ranjan Mishra, Interesting Engineering, 30 Oct. 2025
  • Of LuSEE-Night’s launch mass of 108 kg, about 38 kg is a lithium-ion battery pack with a capacity of 7,160 watt-hours, mostly to generate heat.
    — IEEE Spectrum, 20 Jan. 2026
  • Standard packs offer roughly 538 watt-hours for up to 112 kilometers (70 miles) of range, while larger 808 Wh packs extend that to 160 km (100 miles).
    — IEEE Spectrum, 18 Nov. 2025
  • Their simple, powerful design reportedly delivers record-breaking performance, and reaches 178 watt-hours per kilogram (Wh/kg) and 417 watt-hours per liter (Wh/L) in full pouch cells.
    — Georgina Jedikovska, Interesting Engineering, 16 Oct. 2025
  • The 71-watt-hour battery supports fast charging, and Acer rates it for up to 30 hours of video playback (specifically on the P6’s IPS panel configuration).
    — John Burek, PC Magazine, 29 May 2026
  • As a general rule of thumb, throttle e-bikes that combine a 500-to-750 watt motor and a 480 watt-hour (Wh) battery can cover only about 20 miles at best on battery power alone; or less than 25 watt-hours per mile.
    — IEEE Spectrum, 25 Nov. 2021
  • Portable power for cold climates According to reports, the Pioneer Na has a 900-watt-hour (Wh) capacity, which is sufficient to power laptops, small appliances, or serve as a backup power source.
    — Christopher McFadden, Interesting Engineering, 13 Sep. 2025
  • Last year, global data centers used 448 trillion watt-hours of electricity, more than all but 10 countries of the world, and it is expected to more than double in the next four years, according to a new report from the United Nations University.
    — ABC News, 24 June 2026
  • The Yoga's 75-watt-hour battery—generous for a 14-inch laptop—and energy-efficient chipset overcame the machine's power-hungry high-resolution OLED display.
    — Mark Coppock, PC Magazine, 11 Sep. 2025
  • The company has reportedly set a target to mass-produce batteries with an energy density of 350 watt-hours per kilogram by 2026, a figure that would place it among the most energy-dense automotive batteries currently under development.
    — Kaif Shaikh, Interesting Engineering, 8 June 2026

Some of these examples are programmatically compiled from various online sources to illustrate current usage of the word 'watt-hour.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

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