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Some computer designs have used non-button cell batteries, such as the cylindrical "1/2 AA" used in the Power Mac G4 as well as some older IBM PC compatibles, or a 3-cell nickel–cadmium (Ni–Cd) CMOS battery that looks like a "barrel" (common in Amiga and older IBM PC compatibles), which serves the same purpose. These motherboards often have ...
The Power Management Unit (PMU) is a microcontroller that governs power functions of digital platforms. This microchip has many similar components to the average computer, including firmware and software, memory, a CPU, input/output functions, timers to measure intervals of time, and analog to digital converters to measure the voltages of the main battery or power source of the computer.
IBM ThinkPad 380E — The 380E model introduced several additional features, along with more optional features available. Along with the 16 MB soldered onto the motherboard (a feature carried over from the original 380 model), a single slot accessible through an external cover on the bottom of the case could hold a memory card up to 64 MB in size, allowing a maximum of 80 MB to be installed.
A laptop's battery is charged using an external power supply, which is plugged into a wall outlet. The power supply outputs a DC voltage typically in the range of 7.2—24 volts. The power supply is usually external and connected to the laptop through a DC connector cable. In most cases, it can charge the battery and power the laptop ...
A case's motherboard and power supply unit (PSU) form factor must all match, though some smaller form factor motherboards of the same family will fit larger cases. For example, an ATX case will usually accommodate a microATX motherboard. Laptop computers generally use highly integrated, miniaturized, and customized motherboards.
Sometimes an interrupted flash upgrade of a PC motherboard will brick the board, for example, due to a power outage (or user impatience) during the upgrade process. It is sometimes possible to un-brick such a motherboard, by scavenging a similar but otherwise broken board for a BIOS chip in the hopes that the BIOS will work even halfway, far ...
As a result of the objections to this, Asus provided a free battery replacement program in Hong Kong and Singapore, and ran a paid-for battery exchange program in the UK. Asus has stated that the smaller battery is "presently the standard battery supplied in the UK" and "the default standard battery pack for Asus Eee PC 900 worldwide".
The battery is a rather compact housing Li-Ion with 10.8V 2.3Ah, which is accessed through a small lid on the bottom, as is the hard disk bay. The power supply supports input voltages of 100–240 V AC, with an output rated at 15.6 V 3.85 A.