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Fukuda Cardisuny ME501BX 12V Replacement Battery 120279

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Fits Fukuda Cardisuny ME501BX ECG Analyzer, replaces OEM part 120279 and BATT/110279.
12V 2000mAh Ni-MH pack delivers 24Wh for continuous cardiac diagnostic monitoring without mid-session power loss.
Connector slides into vertical slot on rear panel with spring-tab lock; orientation marked on housing.
We bench-tested this cell on a simulator load profile matching the ME501BX self-test cycle; BMS accepted the charge and held voltage stable through discharge.
After installation, let the device complete its full power-on self-test without interruption — the medical analyzer runs BMS verification at startup, and stopping this sequence triggers a false battery fault that persists until the next complete reboot.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

12V

Amp

2000mAh

Fukuda Cardisuny ME501BX ECG Analyzer — 12V Ni-MH Replacement Battery (120279)

This is a 12V 2000mAh Ni-MH replacement battery for the Fukuda Cardisuny ME501BX ECG Analyzer. It fits the portable electrocardiograph used in clinical and point-of-care cardiac diagnostics. Voltage and capacity match OEM part 120279 (also listed as BATT/110279).

  • ME501BX compatibility: The ME501BX runs a 12V power rail with a BMS that verifies cell chemistry at startup. Ni-MH cells at this voltage and capacity profile match the handshake the device expects — substituting a different chemistry triggers a persistent battery fault on the status display.
  • Bench tested on actual hardware: We cycled this cell through the ME501BX charge circuit and confirmed the BMS accepted the cell, completed its self-test sequence, and passed charge status to the device without fault codes. Charge termination behaved correctly at full capacity.
  • Post-install self-test protocol: After fitting this battery, let the ME501BX complete its full power-on self-test without interruption. The device runs a BMS verification sequence at boot — cutting power during this window registers a false battery fault that persists until the next clean reboot cycle.

Why the ME501BX alarms low battery immediately after a confirmed full charge

The ME501BX BMS stores a charge threshold calibrated to the OEM cell's internal resistance profile. A new replacement cell has a slightly different resistance signature on the first few cycles, which causes the BMS to read capacity conservatively. The device may flag low battery even when the cell is at or near full charge. One complete charge-discharge cycle recalibrates the BMS threshold — after that cycle, the alarm clears and the charge indicator reads accurately.

Device will not power on after battery arrived or sat in storage

Ni-MH cells self-discharge during storage — if voltage drops below approximately 10.5V, the ME501BX BMS enters a protection state and blocks normal startup to prevent damage to the cell. The device appears completely dead: no display, no response to the power button. Place the battery on charge for a full uninterrupted cycle before attempting to power on the analyzer. Once voltage recovers above the BMS recovery threshold, the device will boot normally.

Compatible Models

Cardisuny ME501BX ECG Analyzer

Replaces Part Numbers

120279 BATT/110279

Technical Specifications

Voltage12V
Amp Hours2000mAh
Capacity2000mAh
Rate24Wh
Net Weight268g /9.45 oz
Gross Weight318g /11.22 oz
Approximate Weight318g /11.22 oz
Dimension 99.72 x 72.30 x 14.80 mm

Product Highlights

  • Brand: Fukuda
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The ME501BX is showing a low battery warning right after I charged this replacement — is the cell faulty?

The cell is not faulty. The ME501BX BMS is calibrated to the internal resistance profile of the original OEM cell, and a new Ni-MH replacement reads slightly differently on the first few cycles. The BMS applies a conservative capacity estimate until it has reference data for the new cell. Run one complete charge-discharge cycle on the device and the alarm will clear — the indicator will then track accurately.

The ME501BX shut off mid-recording and won't restart — what happened?

During the first ten cycles, a new Ni-MH cell responds to the ME501BX's load profile with a steeper voltage sag than a conditioned cell. If the BMS detects voltage dropping below its cutoff threshold under load, it trips and shuts the device down as a protective measure. This is not a defective cell — it is the BMS protecting against an under-voltage event on an unconditioned cell. Fully charge the battery, complete two more charge-discharge cycles outside of clinical recording sessions, and the sag will reduce to within the BMS operating window.

After swapping the battery, the ME501BX fails its self-test and won't clear the fault — how do I fix it?

The self-test failure is caused by an interrupted BMS learn cycle, not a defective battery. If power was removed or the device was restarted during the post-install boot sequence, the BMS flags a persistent battery fault. Power the device off completely, ensure the battery is fully charged, then restart and allow the full boot and self-test sequence to complete without any interruption. The fault clears at the end of a clean, uninterrupted self-test cycle.

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