X60 / X61 / tablet batteries: are they the same?

[surfboy]

Subject says it all really. Are there any differences? Does the 4-cell X60 fit the X61 tablet for example, and vice versa.

[kengetz]

FWIW, I purchased an X60 tablet 4-cell battery from Amazon.com, and it fits in the X61 tablet just fine. Can't vouch for other configurations, but with the tablet, it's a perfect fit. I believe the shape of all the X61's matches the corresponding shape of the X60s. -- Ken