00HN933 / SB10G62447 - 3V CR1620 CMOS RTC BIOS Battery for ThinkPad X1 Carbon Gen 4

This genuine OEM CMOS battery assembly supplies backup power to the real-time clock and preserves supported BIOS and UEFI settings while the computer is shut down or disconnected from external power.

Part number 00HN933 is the original 3V CR1620 service assembly used in compatible ThinkPad systems. It includes an insulated lithium coin cell, attached two-wire cable, and the correct two-pin motherboard connector.

Later service replacements may use a CR2016 cell under part number 5B11M05349. The cell designation can differ between production revisions, but the connector, polarity, cable arrangement, voltage, and installation fit must match the original assembly.

Technical Specifications

• Product Type: CMOS / RTC / BIOS backup battery assembly
• Primary FRU Number: 00HN933
• Assembly Number: SB10G62447
• Original Cell Format: CR1620
• Later Service-Replacement Cell: CR2016
• Nominal Voltage: 3V
• Cell Count: One
• Battery Chemistry: Primary lithium coin cell
• Rechargeable: No
• Connector Type: Two-pin micro motherboard connector
• Wire Count: Two
• Installation Type: Internal
• Protective Covering: Insulated heat-shrink wrapper
• Primary Function: Maintains the real-time clock and supported BIOS or UEFI settings while primary power is unavailable
• Application: Compatible ThinkPad laptops using the matching two-pin RTC battery assembly
• Package Contents: One CMOS battery assembly

Interchangeable / Replacement Part Numbers

00HN933, SB10G62447, 023.20005.0001, 0C55358, 00HN615, 02DC036, 04X0443, 5B11J37984, 5B11M05349, 5B11M36868, 023.22016.0311, 23.25207.032

⚠️ Important Battery Revision Notice

The original 00HN933 assembly is documented as a 3V CR1620 battery. The later official service replacement 5B11M05349 is documented as a 3V CR2016 battery with the matching two-pin installation configuration.

A different coin-cell number does not automatically make an assembly incompatible. The replacement must still provide:

• Exactly 3V
• The correct two-pin connector
• Matching connector keying
• Matching wire polarity
• Suitable cable length and routing
• An insulated coin-cell assembly that fits the available space

Do not select a replacement solely because it contains a CR1620 or CR2016 cell. Generic coin-cell assemblies can use reversed polarity, a different plug, incorrect wire spacing, or an unsuitable cable length.

✅ Confirmed Compatibility

Compatibility is limited to systems using 00HN933, SB10G62447, or a documented interchangeable service assembly. Confirm the four-character machine type and original battery connector before installation.

✔️ ThinkPad X1 Carbon 3rd Gen: Machine types 20BS and 20BT
✔️ ThinkPad X1 Carbon 4th Gen: Machine types 20FB and 20FC
✔️ ThinkPad X1 Yoga 1st Gen: Machine types 20FQ and 20FR
✔️ ThinkPad X1 Yoga 2nd Gen: Machine types 20JD, 20JE, 20JF, and 20JG
✔️ ThinkPad X1 Yoga 3rd Gen: Machine types 20LD, 20LE, 20LF, and 20LG
✔️ ThinkPad L390: Machine types 20NR and 20NS
✔️ ThinkPad L390 Yoga: Machine types 20NT and 20NU

☑️ Key Features

☑️ Genuine OEM internal RTC battery assembly
☑️ Original service part number 00HN933
☑️ Original assembly reference SB10G62447
☑️ Regulated 3V coin-cell output
☑️ Correct two-pin motherboard connector
☑️ Attached two-wire cable
☑️ Insulated battery wrapper
☑️ Maintains the system date and time
☑️ Preserves supported BIOS and UEFI settings
☑️ Direct fit for documented X1 Carbon Gen 4 machine types 20FB and 20FC
☑️ Cross-referenced with later service replacement 5B11M05349
☑️ Suitable for additional documented X1 Carbon, X1 Yoga, L390, and L390 Yoga systems

⚙️ Fit Notes

• Confirm the original FRU number, connector shape, wire polarity, and cable routing before ordering.
• ThinkPad X1 Carbon Gen 4 compatibility applies to machine types 20FB and 20FC.
• The original 00HN933 assembly may be marked CR1620.
• The later 5B11M05349 service replacement may be marked CR2016.
• Do not substitute a loose, uninsulated coin cell.
• Do not solder wires directly to a standard coin cell.
• Do not install a battery with reversed wire polarity, even if the connector physically fits.
• Shut down the computer and disconnect the AC adapter before opening the system.
• Disable the built-in battery through the UEFI setup menu when instructed by the applicable hardware-maintenance procedure.
• Disconnect the internal main battery before servicing the RTC battery when required.
• Remove the connector by its plastic housing rather than pulling on the wires.
• Avoid puncturing, crushing, shorting, heating, or attempting to recharge the coin cell.
• The system date, time, boot configuration, or other supported firmware settings may require reconfiguration after replacement.
• Enter the BIOS or UEFI setup after installation, verify the date and time, and save the settings before restarting.