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ThinkPad Battery 42 (3 cell bay) - Overview

Advanced Ultrabay Battery II (43R9250)

Features and specifications

Combine ThinkPad Battery 42 (3 cell bay) (57Y4536) with the system battery to extend the computing experience. Features include:

  • Three cells
  • Lithium-Polymer technology
  • Rechargeable bay battery that operates and recharges in Ultrabay
  • Use with the system battery* to extend the computing experience, stay unpluged longer.For more information, go to:
  • Battery Energy: 32 Wh (Watt-hour)
  • Compatible with the ThinkPad External Battery Charger
  • Hot pluggable supporting "warm/hot swap" using a battery locking switch. When battery is un-locked, a "battery detach notification" is sent to ThinkPad system, the ThinkPad system switches power to the system battery
  • This battery is also available in a retail packaged version for Europe. This design is for showcasing retail setting. The retail packaged version has the following languages: English, Italian, Polish, Slovakian, Slovenian, German, Greek, Czech and French. The Europe Retail Pack part number is 45K1749
  • Previously named as: ThinkPad Advanced Ultrabay Battery III

* The "Hardware Compatibility" table below identifies the compatible ThinkPad systems. For a list of batteries, for each ThinkPad system, go to: Lenovo Support: Batteries: Reference Guide


Physical specifications
  • ThinkPad Battery 42 (3 cell bay) (57Y4536):
    • Approximate height: 10 mm (0.4 in)
    • Approximate width: 128 mm (5.0 in)
    • Approximate depth: 138 mm (5.5 in)
    • Weight: 0.24 kg (0.52 lb)
  • ThinkPad Battery 42 (3 cell bay) (57Y4536) packaged in a carton:
    • Approximate height: 94 mm (3.7 in)
    • Approximate width: 192 mm (7.6 in)
    • Approximate depth: 209 mm (8.2 in)
    • Weight: 0.41 kg (0.90 lb)


Operating environment
  • Temperature: 5 deg to 35 deg C (41 deg to 95 deg F)
  • Relative humidity: 8% to 80%
  • Shock: 50cm free drop
  • Vibration (Random RMS): 0.67 G (5 Hz to 500 Hz)



1 year - Customer Replacement Unit (CRU) Service

  • Announce date: 25 Aug 2009 (Worldwide)
  • Availability date: 25 Aug 2009 (Worldwide)
  • Effective withdrawal date:
    • Europe Retail Pack (45K1749): October 2010
  • Discontinued, no longer available: July 2012. Replaced by ThinkPad Battery 43 (3 Cell Bay)


Hardware compatibility
Machine Type - Models
ThinkPad R60
ThinkPad R61, R61i 14-inch Wide
ThinkPad R61, R61i 14-inch Wide
ThinkPad R61, R61i 15.4-inch Wide
Selected Machine Types. Compatible Machine Types: 7642, 7643, 7644, 7645, 7646, 8914, 8918, 8919, 8920, 8927, 8930, 8932, 8933, 8934, 8935
ThinkPad R400, R500
ThinkPad T60, T60p, T61
ThinkPad T400, T400s, T410s, T410si, T420s, T500
ThinkPad W500
ThinkPad X60, X61, X61s when using the ThinkPad X6 Ultrabase
ThinkPad X60 Tablet, X61 Tablet when using the ThinkPad X6 Tablet Ultrabase
ThinkPad Z60m, Z60t
ThinkPad Z61m, Z61p, Z61t


  • This battery is compatible with the ThinkPad External Battery Charger
  • This battery is not compatible with:
    • ThinkPad T410, T410i, T420, T420i, T510, T510i
    • ThinkPad R60e and Z61e
    • ThinkPad Reserve Edition (X61LS) using the ThinkPad X6 UltraBase
    • ThinkPad R61e/R61i 15.4-inch wide Machine Types: 7649, 7650, and 7657
  • For a list of compatible batteries, for the systems listed above, go to: Lenovo Support: Batteries: Reference Guide
  • Battery
  • Publications


Agency approvals
CE MARK, UL-60950, C-UL, ACA/C-Tick, KC


Additional product information
Publications - Instruction manual for your product
Service parts - Part number listing for your product
Lenovo Support: Batteries: Reference Guide - A list of other batteries
Personal Systems Reference (PSREF) - Comprehensive information on the features and technical specifications of Lenovo products.
All Day Computing ( - Information on batteries, including estimated battery life, and power adapters

If you are unable to find what you are looking for, please do try the following options:
1. Lenovo Assisted Search
2. Product usage and general troubleshooting tips
3. Lenovo Support Forum
4. Technical Support Call Centre

País de disponibilidad
Documento de identidad : PD013115
Legacy Document ID : MIGR-73222
Última actualización :
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