About this replacement
Elcom Euro-150TEi / Euro-50TEi Series — 7.4V Li-ion Replacement Battery (2ICR18650P)
This is a 7.4V, 3350mAh lithium-ion replacement battery for the Elcom Euro-150TEi, Euro-50TEi, and Euro-50TEi Mini cash registers. It slots into the battery bay and connects to the register's onboard trickle charger circuit. The OEM part number is 2ICR18650P.
- Euro-150TEi and Euro-50TEi series compatibility: All three models share the same 7.4V backup battery rail, connector pinout, and BMS handshake. One battery covers the full group — no hardware modification needed.
- Bench tested on actual hardware: We ran this battery through the Euro-50TEi's trickle charge circuit and confirmed the BMS accepted the charge cycle without fault flags. Voltage held steady at 7.4V nominal under simulated mains-loss load.
- First charge after installation: Leave the register powered on mains for at least 12 hours after fitting this battery. The register charges it through a low-current trickle circuit — rushing to test backup mode before the battery is fully charged will give you a false failure result.
Why the Euro-150TEi loses programmed prices after a power outage
Prices, PLU data, and tax rates on these registers live in volatile RAM — not flash storage. The backup battery is the only thing keeping that RAM alive when mains power drops. If the battery voltage falls below roughly 6.0V, the RAM loses power and all programmed data resets to factory defaults. A flat or failing backup battery is the most common cause of repeated data loss after outages. Replacing the battery and allowing a full trickle charge cycle before the next outage prevents this.
Display goes blank the moment mains power cuts out
The Euro-series backup circuit prioritises RAM retention over peripheral power — the display and printer draw significantly more current than the battery's backup circuit is rated to sustain simultaneously. If the display goes dark the instant mains drops but the register recovers when power returns, the battery is either not charged or has degraded below its minimum discharge voltage. Check the battery voltage directly — a healthy, fully charged 2ICR18650P cell pair should read between 8.2V and 8.4V at the terminals. If it reads below 7.0V after a full 12-hour trickle charge, the cell has failed and needs replacement.