From Wikipedia, the free encyclopedia
Backup battery is the name given to a secondary
power supply, usually a
direct current
battery, to provide power in the absence of the main power
supply.
An
electronic device which utilizes a backup battery will
normally get its power directly from a sustainable
alternating current (AC) source or solar cells (DC). The
backup battery will power the circuit only in the event of
failure. The battery is otherwise charging from that same
primary circuit.
Examples: Computers: In computing, the use of a backup
battery is quite common. This version is called a UPS or
uninterruptable power supply in case of blackouts. This
keeps the clock on the computer on "TIME" even when the computer
is switched off. Thus the word Real Time Clock (RTC)
http://www.apc.com
Performance Race Car Industry: Drag Race Cars at the starting
line use far more electricity than their alternators can provide
without tearing away precious horsepower. Recently the elite in
the industry have switched to 16 volt batteries to compensate
for this battery backup need.
http://www.rockracingbattery.com/16v.php
Aircraft Avionics: Can you imagine being at 30,000 feet and
having the engines go out? How about having the engines go out
and then no electricity to run the controls? The FAA thinks this
is a bad idea too! Therefore all commercial and private aircraft
are required to have a deep cycle aircraft battery for their
particular model. These documents are called "Type
Certifications" or "Supplemental Type Certifications". Each
owner must aquire one to change their battery.
http://www.concordebattery.com/faapma.php
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