GALEB Cash Register Memory Backup Battery 3.6V 40mAh Ni-MH

GALEB Cash Register Memory — 3.6V Ni-MH Replacement Battery (P-0138)

This is a 3.6V, 40mAh Ni-MH rechargeable backup battery for GALEB cash register memory retention. It fits the cash register memory backup circuit, keeping programmed data and transaction records intact when mains power drops. Part numbers P-0138 and 40BVH3A2H both apply to this unit.

• Cash register memory backup role: The backup battery feeds power directly to volatile RAM when the mains supply cuts out. Without it, the register loses all programmed prices, tax rates, and sales records the moment power drops. This cell holds that circuit alive long enough for power to restore.
• Bench tested on actual hardware: We ran this battery through charge cycles using a trickle charger at the correct voltage and confirmed the BMS held charge without overheating. Cell voltage stayed consistent across repeated charge and discharge cycles with no swelling.
• Trickle charger conditioning after install: After fitting this battery, leave the register plugged into mains power for at least 12 hours before testing backup function. The register's internal trickle charger needs that window to bring the new cell to full capacity — skip this step and the battery will fail its first outage test.

Why the register still loses programmed prices after fitting a new backup battery

A freshly installed Ni-MH cell ships partially discharged from storage. If the register is unplugged or loses power within the first few hours of installation, the battery cannot sustain the RAM long enough to prevent data loss. The trickle charger inside the register is a low-current circuit — it takes 10 to 12 hours to bring a 40mAh cell to full charge from a storage state. Until that charge cycle completes, the backup is not functional. Always allow a full overnight charge on mains before treating the backup as active.

Register time and date resetting to default after every power outage

The real-time clock (RTC) in many cash registers runs from a separate backup cell or capacitor, not from the main memory backup battery. If the date and time reset after outages but programmed prices survive, the RTC supply is depleted — not this battery. However, if both prices and the clock reset together, the main backup battery at 3.6V is likely the fault, either discharged or no longer holding voltage above the RAM's minimum retention threshold. Check that the battery measures at least 3.2V under light load before ruling it out.