IEI Nova 8450G2-R10 CMOS Backup Battery 3V 200mAh Lithium

IEI Nova 8450G2-R10 / Nova 9453-R11 — 3V Lithium CMOS Backup Battery

This is a 3V 200mAh lithium coin cell for the IEI Nova 8450G2-R10 and Nova 9453-R11 industrial fanless computers. It backs the RTC circuit and CMOS SRAM on the motherboard, keeping the system clock and BIOS configuration alive when mains power is removed. Dimensions are 25.20 x 20.32 x 4.80mm — confirm fitment against the cell holder before ordering.

• Nova 8450G2-R10 and Nova 9453-R11 platform fit: Both units share the same embedded motherboard architecture and CMOS retention circuit, running off a single coin cell at the 3V rail. The cell holder pinout and physical footprint are identical across this IEI platform generation.
• Bench tested on actual hardware: We verified cell voltage at rest and under RTC load. The CMOS circuit drew within expected retention current, and the BMS held steady above the 2.8V minimum retention threshold throughout the test cycle.
• After installation — clock and BIOS reset required: After swapping the cell, enter BIOS immediately and set the correct date and time, then save and exit. The RTC circuit loses its reference during the swap and defaults to a factory timestamp — any automated task, log entry, or scheduled process on this industrial unit will timestamp incorrectly until you correct it manually.

BIOS clock resetting to 2000 after every power cycle on the Nova 8450G2-R10

The RTC circuit on this IEI platform draws a small continuous current from the coin cell to maintain timekeeping when mains power is off. Once the cell drops below 2.8V, the RTC loses retention voltage and resets to its default epoch — typically January 1, 2000. The system will appear to boot normally but the clock will be wrong every single time power is cycled. Replacing the coin cell and resetting the clock in BIOS resolves this immediately.

CMOS checksum error on boot after the coin cell is fully depleted

A checksum error on boot means the CMOS SRAM lost power completely — not just the clock, but the entire stored BIOS configuration. The motherboard detects that the saved settings no longer match the checksum it expects and flags the error before POST completes. At this point, fitting a new cell is not enough on its own — you must enter BIOS, reload defaults or re-enter your configuration, then save and exit to write a valid checksum back to SRAM. Confirm the new cell reads at or above 3.0V before closing the unit.