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Small coin-cell CMOS battery with wire connector for Compaq Presario CQ57-200TU

DBTLAP

DBTLAP CMOS Battery for COMPAQ Presario CQ57-200TU

SKU CH-N3Z4-10MR1

Replaces the CMOS RTC battery on COMPAQ Presario CQ57-200TU motherboards, keeping system time and BIOS settings

  • Battery TypeLithium
  • Keeps system clock accurate with lithium CMOS battery
  • Direct replacement for COMPAQ Presario CQ57-200TU motherboard
  • Pre-tested unit ensures reliable BIOS settings retention
  • Single battery included for straightforward installation
  • Restores date and time after faulty cell removal

What this product is

The DBTLAP CMOS battery is a lithium replacement cell for the COMPAQ Presario CQ57-200TU motherboard. It supplies the low-voltage power that keeps the system clock and BIOS settings alive when the laptop is turned off.

Normal thermals and power

As a passive coin cell it draws no measurable current and produces no heat or noise during everyday operation. The lithium chemistry provides a stable voltage without active cooling or fan requirements.

Sustained-load behaviour

The cell maintains its rated output continuously over years rather than in short bursts. It is tested before shipping to confirm reliable long-term retention of BIOS configuration and real-time clock data.

Highlights

  • Keeps system clock accurate with lithium CMOS battery
  • Direct replacement for COMPAQ Presario CQ57-200TU motherboard
  • Pre-tested unit ensures reliable BIOS settings retention
  • Single battery included for straightforward installation
  • Restores date and time after faulty cell removal

Specifications

Battery TypeLithium

Questions about this item

How do I install this CMOS battery in my COMPAQ Presario CQ57-200TU and what step often goes wrong?

Disconnect the main battery and power, open the case, unplug the old coin cell from the motherboard header, insert the new one with the correct polarity, and reassemble; the step often missed is forgetting to reconnect the main battery before first boot.

What maintenance or replacement will this lithium CMOS battery need later?

The lithium coin cell typically lasts several years; when the system clock starts losing time or BIOS settings reset at boot, replace it with another unit of the same type.

What limit appears first under sustained use of this CMOS battery?

The cell voltage gradually drops until it can no longer hold the real-time clock and CMOS settings, causing the date and time to drift or reset on every power cycle.

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