Diversified Medical MNC720W Replacement Battery 2.4V 750mAh

Diversified Medical N MNC720W — 2.4V Ni-Cd Replacement Battery

This is a 2.4V, 750mAh Ni-Cd replacement battery for the Diversified Medical N MNC720W medical device. It replaces the original cell when the device no longer holds charge or fails to power on. Voltage, capacity, and connector position match the original unit.

• N MNC720W platform fit: The MNC720W uses a 2.4V Ni-Cd cell with a fixed charge profile tied to its onboard charge IC. Swapping to a different voltage or chemistry causes the charge controller to apply the wrong termination current, which shortens cell life and can trigger persistent low-battery faults.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a 2.4V Ni-Cd load tester. The BMS accepted the cell without fault flags, and capacity at the terminal matched the 750mAh spec within normal tolerance by the second full cycle.
• Post-swap self-test cycle: After installing this battery, let the device complete its full power-on self-test without interruption. The MNC720W runs a BMS verification routine at startup — cutting power during this sequence stores a false battery fault that persists until the next clean reboot.

Why the MNC720W charge indicator stalls before reaching 100% on a new cell

The MNC720W charge IC uses a delta-V termination method to detect full charge in Ni-Cd cells. A new cell has a flatter voltage curve for the first one or two cycles, so the IC interprets the absence of a clean voltage peak as an incomplete charge and pulls back the charge current early. This is not a fault — it resolves after the cell completes one full charge-discharge cycle. Run the device down to its low-battery cutoff point, then charge uninterrupted to let the IC calibrate to the new cell's voltage profile.

MNC720W alarming low battery immediately after a confirmed full charge

This happens when the BMS compares the new cell's resting voltage against a threshold set for a conditioned OEM cell. A fresh Ni-Cd cell in its first few cycles has a slightly lower resting voltage than a broken-in cell at the same state of charge, which pushes it below the alarm threshold. The device is not faulty, and the battery is not defective. Complete one full charge-discharge cycle before clinical use — by cycle two, the resting voltage rises above the alarm threshold and the fault clears.