Acer Revo R3610 CMOS Backup Battery 3V 200mAh

Acer Revo R3610 / Aspire L320 — 3V Lithium CMOS Backup Battery

This is a 3V, 200mAh lithium coin cell that replaces the CMOS backup battery on the Acer Revo R3610, Aspire L320, Aspire L3600, Aspire 4310, and four additional Acer models. It powers the RTC circuit and SRAM that hold BIOS settings, clock data, and stored configurations when the machine is unplugged. When the original cell drops below 2.8V retention voltage, those settings are lost on every power cycle.

• Shared fitment across Acer compact and desktop platforms: These Acer models use the same motherboard coin cell socket, 3V supply rail, and contact spring geometry — the cell slots directly into the same retaining clip across the range.
• Bench tested on actual hardware: We seated the cell in a Revo R3610 board, cleared CMOS, and confirmed the BMS — or rather the RTC SRAM — held date, time, and boot order settings across a full mains-off overnight cycle with no voltage drop below 3.0V at the cell terminals.
• Post-install BIOS step: After fitting the new cell, enter BIOS setup and manually set the correct date and time, then save and exit. The RTC circuit resets to a default date on any power interruption, and that default must be overwritten once before the clock will track correctly.

BIOS clock resetting to 2000 after every power cycle

The RTC on these Acer motherboards draws continuous current from the coin cell to maintain both the clock and SRAM contents. When cell voltage falls below 2.8V — the minimum retention threshold — the RTC loses power the moment mains supply is removed. On next boot, the BIOS reads the uninitialized clock and defaults to January 1, 2000. A new cell restores voltage to 3.0V and the RTC retains the correct time across power cycles. Set the clock manually in BIOS after fitting the replacement to clear the default value.

CMOS checksum error on boot after fitting a new coin cell

A checksum error immediately after a cell swap usually means the CMOS SRAM was fully cleared before the new cell made contact — or the contact spring is oxidised and not making a clean connection. The BIOS calculates a checksum of stored settings on every boot; if the SRAM contents are blank or corrupted, the checksum fails and the board throws the error. Check that the cell is seated flat against the spring with no rocking. If the error clears after entering BIOS, saving defaults, and rebooting, the cell and socket are functioning correctly at 3.0V.