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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.
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.
The Laptop Magazine review of the ThinkPad L420 indicated the pros as being the "great keyboard, affordable price, good battery life, and quick boot time". [13] The battery life marked an improvement over the ThinkPad L412, which was criticized for its low battery life. Laptop Magazine indicated that the cons were weak audio, multitouch ...
One point not in the laptop's favor was the low battery life—approximately 2 hours and 30 minutes. The laptop featured up to a 2.53 GHz Intel Core 2 Extreme QX9300 CPU, up to 8 GB of DDR3 RAM (two slots), either an ( MXM -mounted) Nvidia Quadro FX 2700M or FX 3700M with up to 1 GB video RAM, and a 17-inch (43 cm) 16:10 TN LCD display with a ...
The battery life and design were also praised, with the reviewer stating that there was a "huge improvement in the looks department". LAPTOP Magazine offered a similar opinion, stating that, "Lenovo delivers multimedia and gaming power in a portable design, complete with a one-of-a-kind navigation control". [24]
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A battery room is a room that houses batteries for backup or uninterruptible power systems. The rooms are found in telecommunication central offices , and provide standby power for computing equipment in datacenters .
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