Dell Inspiron B120 CMOS Replacement Battery 3V GC02000KH00

Dell Inspiron B120 / B130 / 1300 Series — 3V Lithium CMOS Backup Battery (GC02000KH00)

This is the 3V, 200mAh lithium CMOS battery that keeps the RTC circuit and BIOS settings alive in Dell Inspiron B120, B130, 120L, and 1300 series laptops when mains power is removed. It replaces OEM part numbers GC02000KH00, GC020012R00, GC020012S00, 23.22207.041, and 23.22218-041. When this cell drops below retention voltage, the system clock resets and stored BIOS settings are lost on every power cycle.

• Inspiron B-series and 1300 platform fit: These models share the same motherboard RTC socket, connector footprint, and 3V supply rail to the CMOS SRAM block. One cell covers the full group — no pinout or connector differences between them.
• Bench tested on actual hardware: We confirmed the cell holds above 2.8V retention voltage under low-drain RTC load, and that the BMS handshake with the motherboard does not flag a fault condition during cold boot after installation.
• Post-install clock correction: After fitting this cell, enter BIOS immediately and set the correct date and time before saving and exiting. The RTC circuit defaults to a fixed date when the cell is swapped — it does not pull the correct time automatically. Skip this step and the clock resets again on the next boot.

BIOS clock resetting to 2000 after every power cycle on the Inspiron B120

The RTC circuit on these Inspiron motherboards draws continuously from the CMOS cell, even when the laptop is off and the AC adapter is unplugged. When the cell drops below the 2.8V retention threshold, the SRAM loses its contents and the clock falls back to a hardcoded default — typically January 1, 2000. Swapping the cell stops the reset, but the clock does not self-correct after installation. Enter BIOS on first boot, set the correct date and time, then save and exit to write the values back into SRAM.

CMOS checksum error on boot after fitting a new cell

A checksum error after a new cell is installed usually means the BIOS detected a mismatch between stored settings and the checksum it calculated on boot — this happens because a fully depleted cell left SRAM contents corrupted before the swap, not because the new cell is faulty. Load BIOS defaults, confirm the date and time are correct, then save and exit. If the error reappears on the next boot, check that the cell connector is fully seated — a partially engaged connector leaves the retention voltage intermittent. A correctly seated cell should read at or above 3.0V across the connector pins.