VeriFone VX610 Replacement CMOS Battery 3V 530mAh

VeriFone VX610 — 3V Lithium CMOS Backup Battery

This is a 3V 530mAh lithium coin cell that serves as the CMOS backup battery in the VeriFone VX610 wireless payment terminal. It maintains the RTC clock, internal memory, and system settings when mains power is disconnected. When this cell drops below its retention threshold, the terminal loses its configuration every time power is removed.

• VX610 and VX610 wireless terminal fit: Both variants use the same CMOS circuit and RTC module. The backup cell sits on the same voltage rail across the range, so one cell covers all VX610 configurations.
• Bench tested on actual hardware: We measured open-circuit voltage before and after install. The cell held steady above 3.0V under the low-draw RTC load, and the CMOS circuit registered no checksum fault on boot.
• Post-install clock correction: After swapping the cell, re-enter the correct date and time on the terminal and save. The CMOS cell powers the RTC circuit directly — any gap in power during the swap resets the clock to its default value, and the terminal will not correct this automatically.

Settings lost every time mains power is removed from the VX610

The VX610 stores configuration in SRAM backed by the CMOS cell. When mains power is cut, the cell is the only power source keeping that memory alive. A cell below 2.8V cannot sustain the SRAM retention voltage, and the terminal wakes up in a blank state. Replacing the cell restores the backup path. After fitting the new cell, reconfigure the terminal once and the settings will persist through future power cycles.

New coin cell reading low voltage immediately after install

Lithium coin cells ship at a storage voltage that can read slightly below 3.0V before they are placed under load. This is normal — it does not mean the cell is faulty or partially discharged. Once installed, the cell stabilises at or above 3.0V under the light draw of the RTC circuit within a short period. If the terminal still reports a low battery after the cell has been seated for several hours, check the contact spring for oxidation or deformation and measure voltage directly at the holder terminals.