Physical specifications
NOTE: Actual specifications and weights may vary based on features, vendor components, or manufacturing processes. All weights and dimensions are approximate.

• Width: 304 mm (12.0 in)
• Depth: 250 mm (9.8 in)
• Height: 33.1 mm (1.3 in)
• Weight (approximate):
  • 2Kx/6Kx is 2.34kg (5.16lbs) with CD-ROM, 2.17 kg (4.78lbs) with Travel bezel
  • 5Kx/9Kx is 2.47kg (5.45lbs) with DVD-ROM, 2.21 kg (4.88lbs) with Travel bezel
  • 5Lx/9Lx is 2.50kg (5.50lbs) with DVD-ROM, 2.24 kg (4.94lbs) with Travel bezel
  • 4Mx/8Mx/LMx/GMx is 2.36kg (5.19lbs) with DVD-ROM, 2.11kg (4.64lbs) with Travel bezel
  • 4Nx/8Nx/GNx is 2.37kg (5.24lbs) with DVD-ROM, 2.12kg (4.68lbs) with Travel bezel
  • 4Qx/8Qx/CQx/GQx/L4x is 2.33kg (5.13lbs) with DVD-ROM, 2.08kg (4.58lbs) with Travel bezel
  • 5Mx/9Mx is 2.49kg (5.49lbs) with CD-RW, 2.23kg (4.93lbs) with Travel bezel
  • 5Hx/9Hx is 2.48kg (5.47lbs) with DVD/CDRW, 2.23kg (4.93lbs) with Travel bezel
  • 5Dx/9Dx is 2.48kg (5.48lbs) with DVD-ROM, 2.23kg (4.93lbs) with Travel bezel
  • 5Nx/9Nx/DNx/HNx/NNx is 2.51kg (5.54lbs) with CD-RW, 2.25kg (4.97lbs) with Travel bezel
  • 5Jx/9Jx is 2.50kg (5.52lbs) with DVD/CDRW, 2.25kg (4.97lbs) with Travel bezel
  • 5Fx/9Fx is 2.50kg (5.52lbs) with DVD-ROM, 2.25kg (4.97lbs) with Travel bezel

Accessories

• Li-Ion battery pack: 310g (0.69lb)
• Floppy disk drive (FDD): 210g (0.45lb)
• AC adapter (2-pin or 3-pin): 360g (0.795lb)
• Power cord for ac adapter: Approximate weight is 90g (0.19lb)
• DVD drive: 345g (0.76lb)

Electrical specifications

• Universal ac adapter (72 W)
  • Input is 100/240 V ac, 1.3/0.70 A, 50/60 Hz
  • Output is 16 V dc, 3.5 A
• Li-Ion battery pack: 10.8 V, 3.2 AH, 6 cell/pack

Heat dissipation
191 Btu/hr maximum

Heat emissions
72 watts maximum

Air temperature for shipping and storage
-20 degrees to 60 degrees C (-4 degrees to 140 degrees F)

Acoustic noise level
Category 3D (office environment)

• Sound power level: 4.8 bels (idling), 5.1 bels (hard disk drive seeking)
• Sound pressure level at the operator position: 40 dB (HDD seeking)

NOTE: All measurements are made in accordance with ISO 7779 and reported in conformance with ISO 9296.

Operating environment
ThinkPad computers are designed, built, and tested for high quality and reliability. When used properly in standard business environments, a ThinkPad system should be a reliable computing asset for many years. However, harsh environments and abuse can damage ThinkPad computers since they are not intended to withstand extreme temperatures, dust, shock, or other severe physical environments. ThinkPad systems should not be used in unsuitable environments. For example, a ThinkPad system should not be used in non-stationary environments, such as in-vehicle installations, without additional casing or shock-dissipation. It is warranted that the ThinkPad will conform to its Official Published Specifications when used in a suitable physical operating environment.

Air Temperature

• 0 to 8,000 ft
  • Operating: 5 degrees to 35 degrees C (41 degrees to 95 degrees F) (without diskette)
  • Operating: 10 degrees to 35 degrees C (50 degrees to 95 degrees F) (with diskette inside unit)
  • System off: 5 degrees to 43 degrees C (41 degrees to 110 degrees F)
  • Storage/shipment: -20 degrees to 60 degrees C (-4 degrees to 140 degrees F)
  • Wet bulb (maximum): 29.4 degrees C (85 degrees F)
• 8,000 to 10,000 ft
• Operating: 5 degrees to 31.3 degrees C (41 degrees to 88 degrees F) (without diskette)
• Operating: 10 degrees to 31.3 degrees C (50 degrees to 88 degrees F) (with diskette inside unit)
• System off: 5 degrees to 43 degrees C (41 degrees to 110 degrees F)
• Storage/shipment: -20 degrees to 60 degrees C (-4 degrees to 140 degrees F)
• Wet bulb (maximum): 25.7 degrees C (78 degrees F)

NOTE: The maximum temperature when the system is on is linearly decreased from 8,000 ft to 10,000 ft.

Relative humidity

• Operating: 8% to 95% (without diskette)
• Operating: 8% to 80% (with diskette inside unit)
• Storage/shipment: 5% to 95%

Altitude
10,000 ft maximum (3,048 m)

Agency approvals
System unit

• FCC Class-B Certified to comply with FCC Rules, Part 15
• VCCI Class B
• CISPR22B
• UL-1950
• CSA C22.2 No. 950
• NOM
• UK-PTT
• JATE
• SASO
• IEC950
• CCIB (for China)
• BCIQ (for Taiwan)
• ACA (Australia)
• EMI Declaration of Conformity (New Zealand)
• MPR-II (Sweden)
• CE Mark

Software requirements
The following operating systems support the ThinkPad T23 computer:

• OS/2 Warp Version 4 (with FixPack 14, or later)
• OS/2 Warp Convenience Package
• Microsoft Windows 98 Second Edition
• Microsoft Windows 98 Gold
• Microsoft Windows 95
• Microsoft Windows Me
• Microsoft Windows NT Workstation 4.0
• Microsoft Windows NT Workstation 4.0 Japanese
• Microsoft Windows 2000

NOTE: Previous versions of these operating systems are not supported.

Operating systems other than those preinstalled on the systems may not provide full-feature functionality. To view considerations or Service Hints and Tips by operating system, visit: http://www.lenovo.com/support

• In the search field at the top of the screen enter a four-digit machine type, such as 2647 or 2648.
• Under Search Results, click Product Information.
• Click a heading, such as Considerations for Windows 98, to see a list of considerations or service hints and tips for your machine type.