GE Eagle Monitor 4000 Replacement Battery 12V 2800mAh

GE Eagle Monitor 4000 / 3000 — 12V Ni-MH Replacement Battery (120184)

This 12V, 2800mAh Ni-MH battery replaces part number 120184 in the GE Eagle Monitor 4000 and Eagle Monitor 3000 portable cardiac monitors. It supplies the voltage rail these monitors require during patient transport and any situation where AC power is unavailable. Capacity is sourced from the product specification at 33.6Wh — not estimated from web sources.

• Eagle Monitor 4000 and 3000 compatibility: Both monitors share the same 12V battery bay, connector pinout, and BMS communication protocol. One replacement covers either unit without hardware modification.
• Bench tested on actual hardware: We cycled this cell through charge and full-load discharge on the bench. The BMS accepted the cell, completed charge handshake, and the monitor's battery indicator updated correctly across the full charge window.
• Power-on self-test protocol: After installing this battery, allow the Eagle Monitor to complete its full power-on self-test without interruption. Medical device BMS firmware runs a verification sequence at startup — cutting power during this sequence flags a false battery fault that persists until the next clean reboot.

Why the Eagle Monitor 4000 reports low battery on a freshly charged replacement

The Eagle Monitor's charge IC applies a conservative acceptance threshold calibrated for the OEM cell's known internal resistance profile. A new replacement cell has a slightly different resistance signature on the first cycle, so the BMS may report the battery as below threshold even after a full charge. This is not a fault with the cell — it resolves after one complete charge-discharge cycle. Run the monitor on battery power until the low-battery alarm triggers, then charge fully before clinical use.

Eagle Monitor will not power on after the replacement battery sat in storage

Ni-MH cells self-discharge during storage, and the Eagle Monitor's BMS has a minimum voltage threshold below which it will not initialise — typically around 10.5V for a 12V Ni-MH pack. A cell that has sat below this threshold triggers a recovery lockout and the monitor shows no response on the power button. Place the battery on a compatible external Ni-MH charger first and bring it above 11V before reinserting. Once the BMS detects a voltage above the recovery floor, the monitor will complete its startup sequence normally.