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ThinkPad Battery 27++ (9 cell slice) - Overview

ThinkPad Battery 27++ (9 cell slice) (57Y4545)

Features and specifications

Combine ThinkPad Battery 27++ (9 cell slice) (57Y4545) with the system battery (ThinkPad Battery 55+ (6 cell ) or 55++ (9 cell)) for an all-day computing ( experience.


  • Attaches under the ThinkPad using the ThinkPad docking connectors
  • Rechargeable battery using Lithium-Ion (Li-Ion) technology.
  • Nine-cells
  • Battery Energy: 94 Wh (Watt-hours)
  • Over-discharge protection
  • 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 cannot be used along with ThinkPad Series 3 port replicator and docks.

Physical specifications
  • ThinkPad Battery 27++ (9 cell slice) (57Y4545):
    • Approximate height: 29 mm (1.1 in)
    • Approximate width: 305 mm (12.0 in)
    • Approximate depth: 103 mm (4.1 in)
    • Weight: 0.61 kg (1.4 lb)
  • ThinkPad Battery 27++ (9 cell slice) (57Y4545) packaged in a carton:
    • Approximate height: 76 mm (3.0 in)
    • Approximate width: 373 mm (14.8 in)
    • Approximate depth: 239 mm (9.4 in)
    • Weight: 0.90 kg (2.05 lb)

Operating environment
  • Temperature: 5 deg to 35 deg C (41 deg to 95 deg F)
  • Relative humidity: 8% to 95%
  • Shock: 50cm free drop
  • Vibration (Random RMS): 1.04 G (2 Hz to 200 Hz)


1 year – Customer Replaceable Unit (CRU)

Hardware compatibility
Machine - Models
ThinkPad T410, T410i, T420, T420i, T510, T510i, T520, T520i
ThinkPad W510, W520


  • Battery
  • Publications

Agency approvals
  • CE MARK, UL/cUL, ACA/C-Tick, PSE, KC

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

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1. Lenovo Assisted Search
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País de disponibilidad
Documento de identidad : PD013645
Legacy Document ID : MIGR-74450
Última actualización :
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