Have a second ThinkPad battery charged and ready to go whenever you need it. The ThinkPad External Battery Charger gives you maximum power flexibility by charging a spare battery independent of your ThinkPad system.
Features & Benefits:
• External unit operates independent of your ThinkPad notebook so you can charge a spare battery at any time
• Must be used with the ThinkPad and Lenovo 90W AC Adapter or 65W AC Adapter, which ship with all R60, T60, X60 and Z60 notebooks
• The adapters can also be purchased separately