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Small round lithium CMOS battery for Portege Z935

DBTLAP

DBTLAP CMOS battery for Toshiba Portege Z935

SKU CH-D1GT-NQ31B

A lithium CMOS battery replaces the RTC BIOS cell in a Portege Z935 motherboard

  • Battery typeLithium
  • Direct replacement for Portege Z935 CMOS battery
  • Lithium chemistry maintains real-time clock and BIOS settings
  • Single unit supplied ready for motherboard installation
  • Tested before shipping to ensure reliable operation
  • Fixes faulty or cracked CMOS battery issues

DBTLAP CMOS Battery for Portege Z935

This lithium CMOS battery replaces the RTC BIOS cell on the motherboard of a Toshiba Portege Z935 laptop. It restores system time and BIOS settings when the original coin cell is exhausted. The unit is supplied new and tested before shipping. It is intended for motherboard-level replacement, not for the main laptop battery.

Single replacement cell included

The package contains one CMOS battery only, with no additional cables, brackets or software. Installing the cell restores the real-time clock and preserves BIOS configuration between power cycles. No driver installation or firmware update is required after fitting the replacement.

Check motherboard access before ordering

Replacing this battery requires opening the laptop chassis to reach the motherboard socket. Buyers who are not comfortable with internal disassembly should seek professional installation. This part does not serve as a main power source and will not extend laptop run time.

How it compares

Measured against everything we stock in Household Batteries & Chargers, at today’s prices. Recalculated every night.

Price $11.99
Pricier than about 55% of the 10,440 comparable items (median $10.99).

Specifications

Power
Battery typeLithium

Questions about this item

When will the CMOS battery in the Portege Z935 need replacement?

The lithium CMOS battery typically lasts several years; replace it when the system clock loses time or BIOS settings reset after power-off.

What is the first sign that the CMOS battery is failing under continuous use?

The first limit is voltage drop — the real-time clock drifts and BIOS defaults reload each boot.

Does the CMOS battery generate noticeable heat or noise while the laptop runs all day?

No — a lithium CMOS cell draws microamps, produces no audible noise and no measurable heat during operation.

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