This battery not only makes it operational again, but extends its usability dramatically. The original battery usually held just an hour, this can here (in mint condition) 7 (!!) have hourly output. It fits perfectly in the space provided and is recognized by the device.
I agree with the other reviewers on: the battery survives in my eyes is not a disadvantage; so the device is a bit wrong - it is easier to work on the keyboard and the ventilation is also pleased.