Welch-Allyn ECG ELI 380 11.1V Replacement Battery 4800-017

Welch-Allyn ECG ELI 380 — 11.1V Li-ion Replacement Battery (4800-017)

This is an 11.1V 7800mAh Li-ion battery for the Welch-Allyn ECG ELI 380 portable electrocardiograph. It fits the ELI 380 directly, using OEM part number 4800-017. Capacity is 86.58Wh — matched to the product data, not estimated from a web search.

• ELI 380 compatibility: The ELI 380 runs a single 11.1V three-cell Li-ion pack. The BMS on this device handshakes with the pack over the SMBus lines built into the connector. Voltage rail and connector pinout must match the OEM spec exactly — this battery meets both.
• Bench tested on actual hardware: We cycled this pack through the ELI 380's charge circuit and confirmed the BMS accepted the pack without a fault flag. Cell voltage at full charge held within 10mV balance across all three cells under a simulated ECG acquisition load.
• First-use initialisation on the ELI 380: After installing, run a full calibration cycle through the instrument's battery menu before clinical deployment. The ELI 380 maps pack state during that cycle — skipping it causes the low-battery indicator to trip early during the first ECG session, even with a fully charged pack.

BMS lockout after the ELI 380 sat unused in a carry case for months

Li-ion cells self-discharge at roughly 2–3% per month. After a long storage period, the pack voltage can drop below the BMS recovery threshold — typically around 9V for an 11.1V three-cell pack. At that point the BMS latches into a protective lockout state and the charger sees no load, so it does nothing. Connecting the ELI 380 to its OEM charger for 15–20 minutes will usually wake the BMS if the cells are not fully depleted — the charger applies a low-current preconditioning pulse that nudges cell voltage back above the recovery floor.

ELI 380 shuts down mid-ECG acquisition with no low-battery warning

This is a voltage sag event, not a capacity failure. During sustained 12-lead acquisition the ELI 380 draws current across the ECG front-end, processor, and display simultaneously — peak draw can momentarily pull cell voltage below the BMS cutoff threshold even when the pack shows a healthy state of charge. A degraded cell in a partially aged pack has higher internal resistance, which amplifies the sag. Replacing the pack resolves this if cell impedance has risen — the new pack should show a resting open-circuit voltage of approximately 12.6V at full charge before installation.