Lenovo RTC Battery (FRU02HK904) – CR2032 CMOS Battery for ThinkPad Laptops

When your ThinkPad loses time or BIOS settings after shutdown, the culprit is often a dead RTC battery. This Lenovo FRU02HK904 is the exact replacement part for many ThinkPad models, restoring reliable date, time, and CMOS configuration retention. It's a genuine Lenovo spare, so you get the correct connector, cable length, and mounting fit without guesswork.

Key specifications

• Type: CR2032 lithium coin cell
• Chemistry: Lithium Manganese Dioxide (LiMnO2)
• Voltage: 3V
• Capacity: 210 mAh
• Connector: 2-pin, with approx. 60mm cable
• FRU part number: 02HK904
• Rechargeable: No
• Installation: Internal
• Condition: New

Why choose it

Using a genuine Lenovo FRU ensures perfect compatibility and avoids the risk of third-party batteries with wrong connectors or cable lengths. The pre-attached 2-pin cable makes installation straightforward for technicians and confident DIYers. With a standard CR2032 cell, you get long-lasting performance and stable voltage output.

Ideal use cases

• Replacing a dead CMOS battery in Lenovo ThinkPad laptops
• Fixing incorrect system time or BIOS reset issues
• Routine maintenance for IT departments managing fleets
• Refurbishing used ThinkPads for resale

Good to know

This battery is compatible with a wide range of ThinkPad models, including T490, T590, P53s, X1 Carbon Gen 7/8, X1 Yoga Gen 4/5, L13/L14/L15, E14/E15, P14s, and P15s. Always disconnect power and remove the main battery before installation. Handle the coin cell by its edges to avoid short circuits.