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However this may not remain a misconception for long. Some newer laptops, for example Sony VAIO ultraportables, come with GSM cellphone-based wireless networking capablities, and it is possible to buy add-on PC card GSM modems which provide the same functionality for machines not so equipped. With these, a form of wireless broadband networking is available wherever there is cellphone coverage. Although this is much touted as an ideal business solution, the 'broadband' speeds are low compared to wired connections and the service is prohibitively expensive for most users at the time of writing (1Q 2006). In the US, wireless broadband offered by Cingular and Verizon starts at around $500 for a year with a minimum 2-year contract and each block of data transferred attracts a charge. Unlimited data plans are available but they would normally only appeal to corporate users. * Power-saving processors. While laptops in 1991 were limited to the slower 80286 processor because of the energy demands of the more powerful 80386, the introduction of the Intel 386SX processor, designed for the specific power needs of laptops, marked the point at which laptop needs were included in processor design. * Linuxcertified - Linux laptop * Improved battery technology. The heavy lead-acid batteries were replaced with lighter and more efficient technologies, first nickel metal hydride (NiMH) and then lithium ion and lithium polymer. * Notebook processor: There are a wide range of notebook processors available from Intel (Pentium M (with Centrino technology), Celeron, Intel Core Duo and Centrino Duo) and from AMD (Athlon, Turion 64, and Sempron). Motorola and IBM develop and manufacture the PowerPC chips for Apple notebooks. Generally, notebook processors are less powerful than their desktop counterparts, owing to the need to conserve electricity and reduce heat output. However, the PowerPC G3 and G4 processor generations have been able to offer almost the same performance as their desktop versions, limited mostly by lower performance in other parts of the system bus bandwidth and peripheral units) in Apple's notebooks; recently, though, with the introduction of the G5s, they have been far outstripped. At one point, the Pismo G3, at up to 500 MHz, was faster than the fastest desktop G3 (then the B&W G3), which ran at 450 MHz. Upgradability is severely limited: typically only the RAM and hard drive can be upgraded. Often the CPU can also be replaced, and sometimes video card modules are upgradable too. Many laptops also include a MiniPCI slot inside, however it is usually not intended to be utilized by the end user. Because nearly all functions are integrated into the proprietary-design mainboard theoretically to save space and power, laptops are difficult to repair and upgrade. Outright replacement of faulty parts can include the display screen, drives, daughterboards, modem, storage devices and other components, but repair costs can be high, even when feasible (low upgradability). There is not a standard for A4-size laptops. * Docking stations may be used for expanding connectors and quickly connecting many components to the laptop, although they are falling out of favour as laptops' integral capabilities increase and USB allows several peripherals to be connected through one plug.

* Improved battery technology. The heavy lead-acid batteries were replaced with lighter and more efficient technologies, first nickel metal hydride (NiMH) and then lithium ion and lithium polymer. * Powerful laptops (often heavy) designed to compete with the computing power offered by a typical desktop are sometimes known as desktop replacements. * Improved battery technology. The heavy lead-acid batteries were replaced with lighter and more efficient technologies, first nickel metal hydride (NiMH) and then lithium ion and lithium polymer. * ASUS Laptops generally cost more than a desktop computer of similar specification. Performance is usually lower than that of a comparable desktop because of the compromises necessary to keep weight and power consumption low. * Notebooks smaller than a A4 sheet of paper and weighing around 1 kg are sometimes called sub-notebooks or subnotebooks.

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* Apple Computer - iBook, PowerBook and MacBook Pro Another notable computer was the Cambridge Z88, designed by Clive Sinclair, introduced in 1988. About the size of an A4 sheet of paper, it ran on standard batteries, and contained basic spreadsheet, word processing, and communications programs. Although it anticipated the future miniaturization of the portable computer, as a ROM-based machine with a small display it can — like the TRS-80 Model 100 — also be seen as a foreruner of the PDA. Later PowerBooks introduced the first 256-color displays, first true touchpad, and first built-in Ethernet networking. * Winbook Laptops usually run on batteries, but also from adapters which also charge the battery using mains electricity.

* Current models use lithium ion batteries, which have largely replaced the older nickel metal-hydride technology. Typical battery life for most laptops is two to five hours with light-duty use, but may drop to as little as one hour with intensive use. Batteries gradually degrade over time and eventually need to be replaced, depending on the charging and discharging pattern, from one to five years. * Fujitsu Siemens - Lifebook, FMV - BiBlo * Averatec Laptops generally cost more than a desktop computer of similar specification. Performance is usually lower than that of a comparable desktop because of the compromises necessary to keep weight and power consumption low. Another claim to be the "first laptop" was made by a novice programmer Thomas Kelly in 1982. While it was made to be used upon one's lap, it weighed 150 pounds, and therefore could not be deemed truly portable. * Tablet PC * Sager - NP series * Current models use lithium ion batteries, which have largely replaced the older nickel metal-hydride technology. Typical battery life for most laptops is two to five hours with light-duty use, but may drop to as little as one hour with intensive use. Batteries gradually degrade over time and eventually need to be replaced, depending on the charging and discharging pattern, from one to five years.