If you remove the CMOS battery, you will only lose the date and time. The password block remains intact.
A common misconception is that removing the coin-cell battery (CMOS battery) will reset these passwords. On most modern laptops and specifically on ThinkPads, this is false . The passwords are stored in a separate EEPROM (Electrically Erasable Programmable Read-Only Memory) chip that retains data even without power. Removing the battery will only reset the system clock and hardware settings, not the password. lenovo r61 bios password reset
The Supervisor Password protects the BIOS settings and is stored on a hardware EEPROM chip. If you remove the CMOS battery, you will