T400 & T500 Battery size - what sticks out and what doesn't? *EMBEDDED IMAGES*

I've been seeing a lot of discussion around the various notebook communities about batteries, and wanted to take a moment to discuss them. The big question on everybody's mind is: which batteries fit flush on the new T400 & T500, and which don't?
I'm still trying to get accurate measurements of how far the batteries stick out the back of these machines and I will update this post when I have them. I just wanted to get this out there to hopefully answer people's questions sooner than later. 
Lastly, please note this information applies to R400 & R500 as well. 
Edit Saw this question out there and I updated the info below to show the extra mount of runtime one battery has over another. Obviously your runtime will vary based on usage, but given the capacity of the battery, one can derive how much longer it will run at a given usage level. 
also, anyone know how much longer the life is on a 9 cell vs a 6 cell? 
8/14 Edit - Added all battery measurements except 9-cell. Stay tuned. Note that I also included the total depth of the battery, which is how I calculated how far the batteries stick out. (Depth of larger battery) - (Depth of flush battery) = amount sticking out. I'm normally good with numbers and a calculator, but if I made a mistake feel free to correct me.
8/18 Edit - The measurements for the 9-cell battery are now below, and added photo comparing two systems. Thanks to Matt Kohut for having the systems and the camera.
T400
Short answer - the batteries are the same on T61 and R61 14.1" widescreen:
4-cell: Flush
6, 7, 9-cell: Sticks out
(Note: The 7-cell battery is actually replaced by the 9-cell now)
Long answer:
Length sticking out back of system:
4-cell: 0 inches (1.57 inches deep)
6-cell: 1 inch (2.57 inches deep)
7-cell: 1.08 inches (2.65 inches deep)
9-cell: 1.47 inches (3.04 inches deep)
Part number:
4-cell: 41U3196
6-cell: 41U3198
7-cell: 41U3197
9-cell: 43R2499
Capacity in Wattage-hours:
4-cell: 37.44
6-cell: 56.16 50% longer run-time than 4-cell
7-cell: 74.88 100% longer run-time than 4-cell, 33% longer than 6-cell
9-cell: 84.24 125% > 4-cell, 50% > 6-cell, 12.5% > 7-cell
Important note about 9-cell on T400: As some of you have noted, this battery is uniquely shaped as shown in the photo below. This was done to allow for the increased run-time of the 9-cell battery while still fitting in all of our docking stations. Note that we are no longer offering the 7-cell battery for purchase with new systems and it will not be something offered going forward, you may still be able to purchase it from your local Lenovo teams or resellers/business partners. Contact them directly to find out.
Note: These pictures are of a T61, but you get the idea...
6-cell T61 on top, 9-cell T400 on bottom
T500
Short answer - the batteries are the same on T61 and R61 15.4" widescreen/14.1" standard:
6-cell: Flush
9-cell: Sticks out
Long answer:
Length sticking out back of system:
6-cell: 0 inches (2.3 inches deep)9-cell: 0.83 inches (3.13 inches deep)
Part number:
6-cell: 40Y6799
9-cell: 40Y6797
Capacity in Wattage-hours:
6-cell: 56.16
9-cell: 84.24 50% longer runtime than 6-cell
Message Edited by Tim_Lenovo on 08-13-2008 02:53 PM
Message Edited by Tim_Lenovo on 08-13-2008 02:54 PM
Message Edited by Tim_Lenovo on 08-13-2008 03:02 PM
Message Edited by Tim_Lenovo on 08-14-2008 05:38 PM
Message Edited by Tim_Lenovo on 08-14-2008 05:39 PM
Message Edited by Tim_Lenovo on 08-18-2008 02:51 PM
Message Edited by Tim_Lenovo on 09-12-2008 11:04 AM
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X60 Tablet SXGA+ primary, Z61p fully loaded workhorse

The part number for my 6-cell battery that I received on my system configuration differs than the one that you have listed.
 42V9338   SBB 6 CELL LI-ION BATERRY 
Could it be that T61 batteries are backwards compatible with the T400 and that the T400 also has new batteries?
From looking at the lenovo site to order the T400 it does suggest that 6 cell sticks out but I feel that it could be one of the many errors (although many have been fixed) on the site. 
If you look at tabook.pdf the T61 with a 6 cell has a depth of 10.2 inches whereas the T400 with a 6cell has a depth of 9.4 inches suggesting that the 6cell on the T400 would sit fairly flush with the back of the notebook.  I find it hard to believe that the T400 with a 4cell battery has a depth of 8.5 or so inches.
Any further information would be appreciated

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