Mindray DECG-03A SE-601A Compatible Battery 14.8V 3400mAh

Mindray DECG-03A / MEC-03 — 14.8V Li-ion Replacement Battery (SE-601A)

This 14.8V, 3400mAh (50.32Wh) lithium-ion battery replaces the OEM SE-601A pack in the Mindray DECG-03A electrocardiograph and MEC-03 cardiac monitor. It fits the full DECG-03A platform used in hospital wards, clinics, and emergency departments for portable ECG recording. Voltage and connector match the original — no modification needed.

• DECG-03A / MEC-03 platform fit: Both devices share the SE-601A battery format, the same 14.8V rail, identical connector pinout, and the same BMS handshake protocol. A single cell pack covers both units without any adapter or wiring change.
• Bench tested on actual hardware: We cycled this cell through charge, idle, and load on the DECG-03A platform. The BMS completed its initialisation sequence, charge acceptance was normal from the first cycle, and the device cleared its power-on self-test without fault flags.
• Post-installation self-test protocol: After fitting this battery, let the DECG-03A complete its full power-on self-test without pressing any keys or interrupting the boot sequence. The device BMS runs a chemistry verification at startup — interrupting it plants a false battery fault that persists until the next clean reboot.

Why the DECG-03A reports a battery fault after a confirmed full charge

The DECG-03A charge IC applies a conservative acceptance threshold calibrated to the original OEM cell's internal resistance profile. A new replacement cell has a slightly different impedance signature in the first few cycles, which can cause the BMS to log a mismatch and surface a fault flag even when the cell is fully charged. This is not a defective cell — it is the BMS learn cycle running as intended. One complete charge-to-full, run-to-low, recharge cycle resets the impedance baseline and clears the fault on the next boot.

DECG-03A shutting off mid-recording on a new battery

New lithium-ion cells generate slightly more heat per cycle in the first 10 charge-discharge cycles as the electrolyte settles into the electrode structure. The DECG-03A's BMS monitors cell temperature and voltage sag under the device's ECG acquisition load — if either parameter crosses its threshold, it triggers a protective shutdown to prevent cell damage. This can look like a faulty battery but is a normal conditioning response. Run two or three full charge-discharge cycles outside clinical use first, then verify the cell holds above 13.5V under load before returning the device to patient use.