Battery Lenovo 01HY790 — Replacement internal RTC/CMOS battery for compatible Lenovo laptops

Replacement internal RTC/CMOS battery Lenovo 01HY790 is designed for use in compatible Lenovo laptops and portable devices to provide backup power for the real-time clock and basic system configuration. The battery maintains time, BIOS/UEFI settings and other critical low-power memory when the main battery is removed or fully discharged. It is intended as a direct internal replacement in supported models; verify compatibility with your device or service manual before purchase.

Advantages

This internal RTC/CMOS battery ensures continuous retention of system time and BIOS/UEFI settings, reducing the need to reconfigure firmware options after main battery replacement or long-term storage. Its compact design fits inside compatible laptop housings and provides a reliable low-current source specifically for real-time clock circuitry and CMOS memory. Installation requires minimal tools and preserves user settings when the primary power source is unavailable.

Suitable for

• Maintaining system clock and BIOS/UEFI settings in Lenovo laptops during main battery replacement
• Preserving configuration and low-power memory during device storage or transport
• Repair or refurbishment of compatible portable devices that use an internal RTC/CMOS module

Key specifications

• Function: backup power for real-time clock (RTC) and CMOS/BIOS settings
• Form factor: internal modular battery designed for installation inside laptop chassis
• Voltage and capacity: low-voltage, low-current cell appropriate for RTC applications
• Connection: internal connector or contact designed for compatible motherboard sockets
• Compatibility: intended for specific Lenovo laptop models that accept this internal RTC/CMOS battery

How to use

Power down the laptop and disconnect all external power sources before beginning. Access the internal compartment according to the manufacturer service manual or user guide and locate the RTC/CMOS battery connector on the motherboard. Carefully disconnect the old battery and connect the replacement, ensuring correct polarity and a secure connection. Reassemble the device and reconnect main power; verify system time and BIOS/UEFI settings and update if necessary.

Recommendations

Check device compatibility and follow the laptop manufacturer’s disassembly instructions to avoid damage to internal components. Handle the battery with care, avoid shorting contacts, and dispose of the removed battery in accordance with local electronic waste regulations. If unsure about internal replacement, consult an authorized service provider.