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  2. Backup battery - Wikipedia

    en.wikipedia.org/wiki/Backup_battery

    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 ; rechargeable backup batteries are kept charged by the prime power supply.

  3. Casio 9850 series - Wikipedia

    en.wikipedia.org/wiki/Casio_9850_series

    Battery life for the primary power cells ranges from 300 hours (LR03 battery) to 200 hours (R03 battery) for continuous display of main menu. Backup cells last up to about 2 years each. The calculators weigh about 190 grams including batteries , and measure about 19.7 mm x 83 mm x 176 mm. Features include scientific calculations , including ...

  4. Uninterruptible power supply - Wikipedia

    en.wikipedia.org/wiki/Uninterruptible_power_supply

    The run-time for a battery-operated UPS depends on the type and size of batteries and rate of discharge, and the efficiency of the inverter. The total capacity of a lead–acid battery is a function of the rate at which it is discharged, which is described as Peukert's law. Manufacturers supply run-time rating in minutes for packaged UPS systems.

  5. TI-85 - Wikipedia

    en.wikipedia.org/wiki/TI-85

    1 CR1616 or CR1620 (backup battery) The TI-85 is a graphing calculator made by Texas Instruments based on the Zilog Z80 microprocessor . Designed in 1992 as TI's second graphing calculator (the first was the TI-81 ), it was replaced by the TI-86 , which has also been discontinued.

  6. Peukert's law - Wikipedia

    en.wikipedia.org/wiki/Peukert's_law

    Peukert's law becomes a key issue in a battery electric vehicle, where batteries rated, for example, at a 20-hour discharge time are used at a much shorter discharge time of about 1 hour. At high load currents the internal resistance of a real battery dissipates significant power, reducing the power (watts) available to the load in addition to ...

  7. TI-84 Plus series - Wikipedia

    en.wikipedia.org/wiki/TI-84_Plus_series

    The TI-84 Plus C Silver Edition was released in 2013 as the first Z80-based Texas Instruments graphing calculator with a color screen.It had a 320×240-pixel full-color screen, a modified version of the TI-84 Plus's 2.55MP operating system, a removable 1200 mAh rechargeable lithium-ion battery, and keystroke compatibility with existing math and programming tools. [6]

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  9. Elektronika MK-52 - Wikipedia

    en.wikipedia.org/wiki/Elektronika_MK-52

    The MK-52 is the only calculator known to have internal storage in the form of an EEPROM module. As with many Soviet calculators, the MK-52 has a number of undocumented functions. [4] In November 1988, the MK-52 went into space on the Soyuz TM-7 spacecraft, where it could have been used as a backup to the onboard computers. [1]