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Small round silver lithium CMOS battery in clear bag

DBTLAP

DBTLAP CMOS battery for Compaq Presario CQ40-324LA

SKU CH-XN7Q-C53CE

Lithium CMOS battery maintains BIOS settings for Presario CQ40-324LA motherboards

  • Battery TypeLithium
  • Compatible with Compaq Presario CQ40-324LA
  • Lithium cell maintains BIOS settings reliably
  • Single replacement unit ready for installation
  • Each battery tested before shipment
  • Restores CMOS function on faulty motherboards

Compatible CMOS battery for Presario CQ40-324LA

This DBTLAP lithium CMOS battery replaces the BIOS RTC cell on the Compaq Presario CQ40-324LA motherboard. It maintains system time and firmware settings when the main power is removed. The part is intended for owners of that specific model who need a direct replacement. It is not a main laptop battery and will not power the portable computer itself.

Simple two-wire installation with polarity care

The battery ships pre-tested and connects via its existing lead to the motherboard header. Installation requires opening the chassis, locating the CMOS socket and matching the connector orientation. The most common issue is reversing the polarity or failing to seat the plug fully, which leaves the clock unpowered. No soldering or configuration is needed beyond the physical connection.

Lithium coin-cell chemistry defines service life

The lithium cell provides the stable low-current supply the real-time clock expects. Over years the voltage will gradually decline until the firmware loses its settings on power loss. The standard interface is a simple two-pin header, so no protocol or firmware negotiation occurs. Capacity fade is the only practical limit; the board will not report health until the date resets.

Highlights

  • Compatible with Compaq Presario CQ40-324LA
  • Lithium cell maintains BIOS settings reliably
  • Single replacement unit ready for installation
  • Each battery tested before shipment
  • Restores CMOS function on faulty motherboards

Specifications

Battery TypeLithium

Questions about this item

How can I verify the CMOS battery is working after installing it in my CQ40-324LA?

After fitting the battery, power on the laptop and enter the BIOS setup. If the system clock holds the correct date and time across reboots and no CMOS checksum errors appear, the battery is functioning correctly.

What comes in the package and is any extra hardware required for the CQ40-324LA installation?

The box contains one lithium CMOS battery. No additional cables, brackets or tools are supplied; you only need a small Phillips screwdriver to open the laptop chassis and reach the motherboard socket.

Which version of this CMOS battery should I select for the Presario CQ40-324LA?

This DBTLAP lithium cell is the single version listed for the CQ40-324LA. It matches the original voltage and connector, so no capacity or model choice is needed — just order this one.

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