The ThinkPad Battery 59+ (6 cell) (51J0497) features:

• Lithium-Ion (Li-Ion) technology
• Six-cell, rechargeable system battery
• Battery Energy: 44 Wh (Watt-hour)
• Standard system battery specifications
• Over-discharge protection
• Compatible to ThinkPad External Battery Charger
• Previously named as: ThinkPad T400s Series 6 cell Li-Ion battery

Physical specifications:

• ThinkPad Battery 59+ (6 cell) (51J0497):
  • Approximate height: 17 mm (0.7 in)
  • Approximate width: 74 mm (2.9 in)
  • Approximate depth: 262 mm (10.3 in)
  • Weight: 0.31 kg (0.7 lb)
• ThinkPad Battery 59+ (6 cell) (51J0497) packaged in a carton:
  • Approximate height: 50 mm (2.0 in)
  • Approximate width: 300 mm (11.8 in)
  • Approximate depth: 262 mm (5.3 in)
  • Weight: 0.40 kg (0.9 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)