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RWebb-
The 6-cell and 9-cell are NOT the Ultrabay batteries, they are the 'standard' and 'large' versions that fit in the primary battery spot.
The Ultrabay takes a special 3-cell secondary battery intended to supplement the 6-cell in the primary battery spot. As you know, in order to utilize the Ultrabay you are removing the optical drive. So why not just put in the 9-cell large battery in the first place??
E
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