![]() These early machines required the backup battery to be replaced periodically due to the relatively large power consumption. The original IBM AT through to the PS/2 range, used a relatively large primary lithium battery, compared to later models, to retain the clock and configuration memory. This is often called the CMOS battery or BIOS battery. Modern personal computer motherboards have a backup battery to run the real-time clock circuit and retain configuration memory while the system is turned off. It is also why if there is a power outage in the area, most burglar alarms do start ringing and cannot be realistically stopped until the main power is restored.ĬR2032 battery used as backup battery on a notebook motherboard This however means that the alarm cannot be stopped in any way apart from physically going outside to the bellbox and disabling the siren. Should this fail as well (for example, a power cut), it usually triggers a third backup battery located in the bellboxes on the outside of the building which simply triggers the bell or siren. The backup battery usually has a lifespan of 3-10 years depending on the make and model, and so if the battery runs flat, there is only one main source of power to the whole system which is the mains power. Additionally these batteries power the remote cellular phone systems that thwart phone line snipping as well. The backup battery prevents the burglar from disabling the alarm by turning off power to the building. Large aircraft may have a ram air turbine to provide additional power during engine failures.īackup batteries are almost always used in burglar alarms. ![]() The battery keeps all necessary items running for between 30 minutes and 3 hours. ![]() Aircraft batteries are either nickel-cadmium or valve-regulated lead acid type. Larger aircraft have control surfaces that run on these backups as well. The batteries keeping navigation, ELUs (emergency lighting units), emergency pressure or oxygen systems running at altitude, and radio equipment operational. Each aircraft has enough power in the backup batteries to facilitate a safe landing. ![]() Small backup batteries may be primary cells rechargeable backup batteries are kept charged by the prime power supply.Įxamples Aircraft emergency batteries īackup batteries in aircraft keep essential instruments and devices running in the event of an engine power failure. 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. A backup battery provides power to a system when the primary source of power is unavailable. ![]()
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