A small number of  ThinkPad users have reported receiving an error message about their ibm laptop battery. If you have received an irreparable damage or battery cannot be charged error message from your computer’s battery, you may run the newest version of the Battery Verification Tool (released 25 Feb 2008). The Battery Verification Tool will tell you if your battery failed due to this issue, and if so, will direct you to the site where you can request a replacement.

• If your thinkpad r60 battery has failed, use the Battery Verification Tool to determine if you are eligible for a replacement. If you are eligible, you will automatically be directed to the site where you can request a replacement.
• Lenovo is offering replacements only for batteries that have failed due to this problem. Lenovo will replace these failed batteries for up to 6 months past the expiration date of the battery warranty.

Note: Only a very small percentage of batteries will fail due to this issue.

About the Battery Verification Tool:

• You must be connected to this site on the computer you wish to check. The failed battery must be installed on the computer you wish to check.
• The Battery Verification Tool automatically downloads to your system and checks your battery. The tool removes itself once it is finished.
• If you are not redirected to another Web site with further instructions, please temporarily disable your firewall software and run the tool again.

From : http://www-307.ibm.com/pc/support/site.wss/MIGR-67765.html 

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Model #: 2623-D3U
Processor: Intel T2500 2.0GHz Core Duo
Motherboard Chipset: Intel Calistoga i945GM/PM
Hard Drive: 100GB 5400RPM SATA (Hitachi Travelstar HTS541010G9SA00)
Memory/RAM: 1GB (1,024MB) (configurable up to 4GB)
Screen: 15.0″ 1400 x 1050 SXGA+ (LG Philips LP150E05 – A2)
Graphics: ATI X1400 128MB
Optical Drive: Multi-Burner DVD recordable
Battery: 9-cell Ibm ThinkPad t60 Battery (extended life, protrudes from back of notebook)
Wireless: Intel PRO/Wireless 3945ABG (802.11 a/b/g), Bluetooth 2.0, InfraRed
User Input: Touchpad, Pointing Stick, UltraNav buttons, Fingerpring Scanner
Warranty: 3-years parts and labor, 1-year battery
Dimensions:
14.1″ screen config: 12.2″ x 10.0″ x 1.0-1.2″ (width x depth x thickness)
15″ screen config: 13″ x 10.6″ x 1.2-1.4″ (width x depth x thickness)
Weight: 6.4lbs (14″ T60 is about 5.2 lbs with a 6-cell battery and optical drive)
Ports:
3 USB 2.0 ports
dock/port replicator
Display-out
Ibm Thinkpad T60 AC adapter port
RJ-11 (Modem)
RJ-45 (Ethernet LAN)
Audio line out for headphone/speakers
Microphone
Slots:
1 Type II PC card slot
1 ExpressCard 54 slot
Buttons:
Power on/off
Volume up/down/mute (3 buttons)
Wireless on/off
ThinkVantage shortcut button (shortcut to system support, security and diagnostics suite)
Battery lock and release
Battery

I have the 9-cell ibm battery with the T60 being reviewed. It adds a bit of weight over the standard 6-cell thinkpad t60 battery and sticks out but if you want close to 4 hours of battery life with the 15″ screen model you’ll need this size. In using the T60 without Wi-Fi and at medium brightness (3rd notch of 7) it got 3 hours 42 minutes of battery life when used lightly (typing review, or idling). You can expect to get over 3 hours with Wi-Fi on and finishing a DVD with the 9-cell ibm thinkpad t60 battery shouldn’t be a problem, well, unless it’s Lord of the Rings.

The T60 14″ screen size will do much better in terms of time of battery life per cell because a smaller screen just drains less battery. My guess is the 6-cell battery for the T60 14″ will get you about what the 9-cell battery does for the 15″ — again, that’s just a mildly educated guess.