Battery Lenovo RTC 1C 3V Li‑ion CR1620 FRU00HN933 – RTC backup coin cell, 3V

Replacement RTC backup coin cell designed for Lenovo systems in CR1620 format with a nominal voltage of 3V. This compact Li‑ion battery is intended to preserve the real-time clock and BIOS configuration when the main power source is disconnected, ensuring system time, boot settings and basic CMOS parameters remain intact during maintenance, storage or component replacement.

Advantages

The battery provides stable low-current standby operation and compact dimensions that fit standard CR1620 holders used in many laptop and desktop motherboard designs. It is suitable for long-term calendar and BIOS parameter retention with minimal self-discharge, enabling reliable timekeeping and configuration preservation without requiring constant external power.

Key specifications

• Cell format: CR1620 (coin cell)
• Nominal voltage: 3 V
• Chemistry: Lithium (Li‑ion style coin cell chemistry suited for RTC backup)
• Typical use: low-current standby for real-time clock and CMOS memory retention
• Physical form factor: coin-shaped, designed for standard CR1620 battery holders
• Operating temperature range: standard consumer electronics range suitable for laptops and desktops

How to use

Power down the system and disconnect it from mains power. Locate the RTC battery holder on the motherboard, gently remove the old CR1620 coin cell using a non-conductive tool if necessary, and insert the replacement with correct polarity orientation (+ side typically visible). Reconnect power and boot the system to confirm BIOS time and settings retention. If required, enter BIOS/UEFI to set date and time and verify saved configurations after a power cycle.

Recommendations

Store unused batteries in a cool, dry place away from direct sunlight and metal objects. Replace the RTC battery when BIOS reports low battery or when system time and settings are not retained; dispose of removed cells according to local battery recycling regulations.