About this replacement
Olympia NC325 / NC335 / NC315 — 11.1V Li-Polymer Replacement Battery (72084263)
This is an 11.1V 700mAh lithium-polymer battery for the Olympia NC325, NC335, and NC315 cash registers. It replaces OEM part number 72084263. The battery sits inside the register and keeps memory and basic functions alive when mains power is lost.
- NC315 / NC325 / NC335 compatibility: All three models use the same 11.1V battery rail, the same 72084263 cell pack, and the same BMS handshake through the register's trickle charge circuit. One part number covers all three.
- Bench tested on actual hardware: We ran this cell pack through the NC-series charge circuit and confirmed the BMS accepted the trickle charge signal without fault. Voltage held steady across the full charge cycle with no cutoff events.
- First-install charge requirement: After fitting this battery, leave the register connected to mains power for 12 hours before testing backup performance. The NC-series trickle charger is slow by design — the cell pack needs a full cycle through the register before it can sustain memory during an outage.
Why the NC325 loses programmed prices after a power outage
The NC325 stores PLU data and department prices in volatile RAM. That RAM needs a continuous low-current feed from the backup battery the moment mains power drops. If the battery voltage falls below roughly 9V under load, the RAM loses power before the register can shut down cleanly. A degraded or newly installed but uncharged cell is the most common cause of price data wiping after an outage. Fit the new battery, charge on mains for 12 hours, then test by pulling the mains plug briefly.
Register display goes blank the moment mains power fails
The NC-series display and printer draw more current than the backup battery is rated to sustain simultaneously. The backup circuit is sized to keep RAM and the RTC alive — not to run the full display stack. When mains fails, the display going blank is normal behaviour. If the register is also losing data at that point, the issue is battery voltage, not the display itself. Check that the battery rests at 11.1V on a multimeter before fitting — a cell below 10V at rest will not recover through the trickle charger and needs replacement.