Cardioline ECG Delta 60 Replacement Battery 24V 1300mAh

Cardioline ECG Delta 60 / Delta 60Plus — 24V Ni-MH Replacement Battery (120260)

This is a 24V 1300mAh Ni-MH replacement battery for the Cardioline ECG Delta 60 and Delta 60Plus electrocardiograph. It restores cordless operation during patient examinations in clinical settings. OEM part numbers include 120260, BATT/110260, and 7741715, among others listed against this unit.

• ECG Delta 60 and Delta 60Plus compatibility: Both variants share the same 24V power rail, connector format, and BMS handshake protocol, which is why a single cell fits the full range. The physical dimensions — 87.50 x 68.00 x 87.90 mm — match the battery bay on both chassis without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Delta 60 platform and confirmed the BMS accepted the cell without triggering a fault flag. The protection circuit responded correctly to load variation during the simulated ECG acquisition cycle.
• Post-installation self-test cycle: After fitting this battery, allow the Delta 60 to complete its full power-on self-test without interruption. Medical-grade BMS firmware runs a verification routine at startup, and cutting power mid-sequence stores a false battery fault that will persist until the next clean reboot.

Why the Delta 60 BMS rejects a new Ni-MH cell on the first charge cycle

The Delta 60 charge IC applies chemistry-specific threshold checks inherited from the OEM cell's calibration history. A fresh Ni-MH cell has no learned capacity data in the BMS register, so the controller defaults to a conservative acceptance window. This can cause the charge indicator to stall before reaching 100% on the first cycle. Running one complete charge-discharge cycle allows the BMS to build a capacity baseline and unlocks normal charge termination on subsequent cycles.

Device shuts off mid-examination despite showing adequate charge

The Delta 60 draws a sharp current spike during ECG signal acquisition, and in the first ten cycles a new Ni-MH cell shows higher internal resistance than a conditioned one. That resistance causes a momentary voltage sag that the BMS reads as an undervoltage event and triggers a protective shutdown. This is not a faulty cell — it is the BMS responding to a transient load the cell has not yet conditioned against. Complete three to five full charge-discharge cycles before using the device in a clinical examination context; internal resistance drops measurably by cycle four.