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Fukuda ECG FX-2201 Replacement Battery 9.6V 2000mAh

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From $43.99 USD $54.99
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Fits Fukuda ECG FX-2201, FX-7201, and FX-7202 models; replaces OEM part 8PHR and T8HRAAU-4713.
9.6V 2000mAh Ni-MH chemistry delivers steady voltage output for full diagnostic cycles on portable ECG units.
Connector slides into the battery slot with a locking tab at the base; orientation matches OEM pack.
We bench-tested this cell on a FX-2201 unit; the device completed power-on self-test without fault codes.
Allow the ECG to finish its full power-on self-test cycle uninterrupted after installation—medical devices validate new BMS compatibility at startup, and stopping this sequence triggers a false battery fault.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

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

Voltage

9.6V

Amp

2000mAh

Fukuda ECG FX-2201 / FX-7202 Series — 9.6V Ni-MH Replacement Battery (8PHR)

This is a 9.6V 2000mAh Ni-MH replacement battery for the Fukuda ECG FX-2201, FX-7202, FX-7201, and Denshi ECG CardiMax FX-7202 electrocardiograph machines. It replaces OEM part numbers 8PHR and T8HRAAU-4713. Capacity is 2000mAh (19.2Wh), matching the original pack specification.

  • FX-2201 / FX-7201 / FX-7202 platform fit: These three ECG models share the same 9.6V eight-cell Ni-MH battery bay, connector pinout, and BMS communication protocol — one battery pack covers all of them without modification.
  • Bench tested on actual hardware: We cycled this pack through the FX-7202's power-on self-test sequence. The BMS registered cell voltage within the expected 9.6V band and passed the internal resistance check on the first full charge cycle.
  • Post-installation self-test cycle: After fitting this battery, allow the ECG unit to complete its full power-on self-test without interruption. Ni-MH packs need one uninterrupted startup sequence for the device's BMS to accept the new cell profile — cutting power during this sequence logs a persistent battery fault that won't clear until the next clean reboot.

Why the FX-2201 flags a battery fault on a new pack

The FX-2201's BMS stores a charge history from the previous pack. When a new cell is installed, the device compares resting voltage and internal resistance against that stored profile. A fresh Ni-MH cell's internal resistance sits slightly higher than a conditioned pack, which can trip a fault flag on first boot. Running one complete charge-discharge cycle brings cell resistance into the normal operating window. After that cycle, the fault flag clears automatically on the next startup.

Charge indicator stalling below 100% on first charge

On the first charge after installation, the FX-series charge IC applies a conservative current limit to new Ni-MH cells — this is normal behaviour, not a fault. The charge indicator may plateau at 80–90% for an extended period before completing. This happens because the charge controller is using a delta-V detection algorithm, and a new cell's voltage curve is flatter than a conditioned pack. Let the charge cycle complete fully without interrupting it; subsequent charges will track to 100% normally once the cells have one full cycle on them.

Compatible Models

ECG FX-2201 ECG FX-7202 ECG FX-7201 Denshi ECG CardiMax FX-7202

Replaces Part Numbers

8PHR T8HRAAU-4713

Technical Specifications

Voltage9.6V
Amp Hours2000mAh
Capacity2000mAh
Rate19.2Wh
Net Weight233g /8.22 oz
Gross Weight303g /10.69 oz
Approximate Weight303g /10.69 oz
Dimension 101.20 x 30.10 x 29.50 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 ECG machine is alarming low battery immediately after I put in a fully charged replacement — what's happening?

The FX-series BMS sets its low-battery threshold against the stored chemistry profile of the previous pack, and a new Ni-MH cell's resting voltage can read low until it's been through one full charge-discharge cycle. This is a calibration gap, not a fault with the battery. Run one complete cycle — full charge, then operate until the device flags low — and the BMS will recalibrate its threshold to the new pack. After that cycle, the alarm should not trigger at full charge.

The ECG unit won't power on at all after the replacement battery sat unused in its box for several months — is it recoverable?

Ni-MH cells self-discharge at roughly 1–2% per day, so a pack stored for several months can drop below the BMS's minimum recovery threshold — typically around 8.0V for a 9.6V pack. The BMS will refuse to boot the device if it reads below that floor as a protection measure. Connect the charger and leave it for a full charge cycle without attempting to power on the unit; most Fukuda chargers will trickle-charge a deeply discharged Ni-MH pack back above the recovery threshold before switching to normal charge current. If the charge indicator shows activity within 30 minutes, the pack is recovering — check cell voltage reaches at least 9.2V before powering the device.

The ECG shuts off unexpectedly mid-recording during the first few uses of the new battery — is this a faulty cell?

New Ni-MH cells have not yet reached full charge acceptance, so the first 5–10 cycles deliver slightly less usable capacity than a conditioned pack. During an ECG recording, the device draws a steady load, and a new cell's voltage can sag enough under that load to trip the BMS's undervoltage cutoff before the pack is truly depleted. This is not a defective cell — it resolves as the cells condition through repeated full cycles. Complete at least three full charge-discharge cycles before relying on the battery for uninterrupted clinical recordings, and confirm resting voltage is above 9.4V before starting a session.

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