Dynabook/Toshiba RTC BATTERY A000210800 is compatible in the following Models:

Dynabook/Toshiba SATELLITE Series

U Series U840 - PSU4RA-00Q00C

U Series U840 - PSU4SA-015005

U Series U840 - PSU4WA-006004

U Series U840 - PSU4WA-00R004

U Series U840W - PSU5RA-002001

U Series U840W - PSU5RA-014001

U Series U840W - PSU5XA-001006