Fits and works fine in the Toshiba Satellite laptop, EXCEPT it only lasts about 1 hour 20mins before it needs a re-charge.
When I first ordered this, they sent a genuine Toshiba part, but the most I could get out of it was 45-50 mins.
The supplier took it back and replaced it quickly with a 'pattern' one, which they said would be much better.
Despite breaking it in with 'gentle excercising', and frequently running it down to 3 or 4% it has never got much better.
This is 4400 mAH, and the original battery supplied with the machine was 4000 mAh. When the laptop was new I could get 2 hours + without worrying, and I did hope that putting a fresh LARGER capacity set of cells in the laptop would get me 'back there' - alas no.
But it was cheaper than elsewhere, so I guess you can't have everything.