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  2. Nickel–iron battery - Wikipedia

    en.wikipedia.org/wiki/Nickel–iron_battery

    The nickel–iron battery (NiFe battery) is a rechargeable battery having nickel (III) oxide-hydroxide positive plates and iron negative plates, with an electrolyte of potassium hydroxide. The active materials are held in nickel-plated steel tubes or perforated pockets. It is a very robust battery which is tolerant of abuse, (overcharge ...

  3. Emergency light - Wikipedia

    en.wikipedia.org/wiki/Emergency_light

    An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage. In the United States, emergency lights are standard in new commercial and high occupancy residential buildings, such as college dormitories, apartments, and hotels. Most building codes in the US require that they be ...

  4. Lithium-ion battery - Wikipedia

    en.wikipedia.org/wiki/Lithium-ion_battery

    Nominal cell voltage. 3.6 / 3.7 / 3.8 / 3.85 V, LiFePO4 3.2 V, Li4Ti5O12 2.3 V. A lithium-ion or Li-ion battery is a type of rechargeable battery that uses the reversible intercalation of Li + ions into electronically conducting solids to store energy. In comparison with other commercial rechargeable batteries, Li-ion batteries are ...

  5. Tesla Powerwall - Wikipedia

    en.wikipedia.org/wiki/Tesla_Powerwall

    The Tesla Powerwall is a rechargeable lithium-ion battery stationary home energy storage product manufactured by Tesla Energy. The Powerwall stores electricity for solar self-consumption, time of use load shifting, and backup power. [1][2] The Powerwall was introduced in 2015 as Powerwall 1 with limited production.

  6. Backup battery - Wikipedia

    en.wikipedia.org/wiki/Backup_battery

    A backup battery provides power to a system when the primary source of power is unavailable. Backup batteries range from small single cells to retain clock time and date in computers, up to large battery room facilities that power uninterruptible power supply systems for large data centers. Small backup batteries may be primary cells ...

  7. Indexed unit of account - Wikipedia

    en.wikipedia.org/wiki/Indexed_unit_of_account

    A daily indexed unit of account or Daily Consumer Price Index (Daily CPI) can be used in contracts or in the Capital Maintenance in Units of Constant Purchasing Power accounting model, to ensure that deferred payments and constant real value non-monetary items are indexed to the general price level in terms of a Daily Index.

  8. Electric battery - Wikipedia

    en.wikipedia.org/wiki/Electric_battery

    An electric battery is a source of electric power consisting of one or more electrochemical cells with external connections [1] for powering electrical devices. When a battery is supplying power, its positive terminal is the cathode and its negative terminal is the anode. [2] The terminal marked negative is the source of electrons.

  9. Retail Price Index - Wikipedia

    en.wikipedia.org/wiki/Retail_Price_Index

    In the United Kingdom, the Retail Prices Index or Retail Price Index[1] (RPI) is a measure of inflation published monthly by the Office for National Statistics. It measures the change in the cost of a representative sample of retail goods and services. As the RPI was held not to meet international statistical standards, since 2013, the Office ...