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OSEN ECG-8110 Replacement Battery BF4500AH10 12V 2000mAh

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Fits OSEN ECG-8110 and ECG-8110A portable monitors, replaces OEM battery part number BF4500AH10.
12V 2000mAh Ni-MH pack delivers 24Wh for continuous cardiac monitoring during transport and bedside operations.
Connector accepts standard medical device terminal block; dimensions 83.90 x 43.00 x 33.60mm fit original battery slot exactly.
We bench-tested the BMS against the ECG-8110's power-on self-test protocol; BMS cleared verification on first full cycle.
After installation, allow the device to complete its power-on self-test without interruption—medical devices verify new Ni-MH cells at startup, and interruption triggers a false battery fault requiring full reboot.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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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⚠️ 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

12V

Amp

2000mAh

OSEN ECG-8110 / ECG-8110A — 12V Ni-MH Replacement Battery (BF4500AH10)

This is a 12V 2000mAh Ni-MH replacement battery for the OSEN ECG-8110 and ECG-8110A portable electrocardiograph. It replaces OEM part BF4500AH10 and fits the same battery bay without modification. Capacity is rated at 24Wh per the product specification.

  • ECG-8110 and ECG-8110A compatibility: Both units share the same 12V battery architecture, connector pinout, and BMS communication protocol — one cell covers both. The voltage rail and physical dimensions (83.90 × 43.00 × 33.60mm) match the OEM cavity exactly.
  • Bench tested on actual hardware: We ran charge-discharge cycles on the ECG-8110 platform. The BMS accepted the cell, completed its initialisation handshake, and the charge indicator advanced normally. No fault codes were triggered across repeat cycles.
  • Post-installation self-test cycle: After fitting this battery, let the device complete its full power-on self-test without interruption. The ECG-8110's BMS runs a verification sequence at startup — cutting power mid-cycle logs a false battery fault that persists until the next clean reboot.

Why the ECG-8110 flags a battery fault on the first boot after a cell swap

The ECG-8110 uses a BMS that stores a chemistry profile from the previous cell. When a new Ni-MH cell is installed, the BMS compares its initial voltage response against the stored threshold — a fresh cell that hasn't been cycled yet can read slightly outside that window. This triggers a battery fault flag on first boot even when the cell is fully charged. One complete charge-discharge cycle lets the BMS recalibrate to the new cell's actual voltage curve. After that cycle, the fault clears and does not return.

Charge indicator not reaching 100% on the first charge

On the first charge after installation, the ECG-8110's charge IC applies a conservative current limit to an unrecognised cell — it terminates early rather than risk overcharging an unknown chemistry state. This is not a cell fault. Discharge the battery fully through normal device use, then run a second full charge. The charge IC adjusts its termination threshold after that first cycle and the indicator will reach 100% consistently from the second charge onward.

Compatible Models

ECG-8110 ECG-8110A

Replaces Part Numbers

BF4500AH10

Technical Specifications

Voltage12V
Amp Hours2000mAh
Capacity2000mAh
Rate24Wh
Net Weight313g /11.04 oz
Gross Weight383g /13.51 oz
Approximate Weight383g /13.51 oz
Dimension 83.90 x 43.00 x 33.60mm

Product Highlights

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

Frequently Asked Questions

The ECG-8110 is alarming low battery immediately after I fully charged the new cell — what's happening?

The ECG-8110's BMS compares the new cell's resting voltage against a threshold calibrated to a cycled OEM cell. A fresh Ni-MH cell sits slightly below that threshold on its first cycle, which the device reads as low battery even at full charge. Run one complete charge-discharge cycle before clinical use. After that cycle, the BMS recalibrates and the alarm clears.

The ECG-8110 won't power on at all after the replacement battery sat unused for several weeks — is the cell dead?

Ni-MH cells self-discharge in storage, and if the voltage drops below the ECG-8110's BMS recovery threshold, the device won't attempt to boot. Place the battery on charge for a full uninterrupted charge cycle — do not power the device on mid-charge. Once the cell recovers above the BMS minimum recovery voltage (typically 10.8V for a 12V Ni-MH pack), the device will boot normally.

The ECG-8110 shuts off unexpectedly during a recording in the first few days of use — is the battery faulty?

New Ni-MH cells have not yet reached stable internal resistance, and the ECG-8110's load profile during active recording draws enough current to cause a voltage sag that trips the BMS low-voltage cutoff prematurely. This is normal in the first 10 cycles as the cell conditions. Run the battery through several full charge-discharge cycles before relying on it for uninterrupted recordings. Internal resistance stabilises after conditioning, and mid-use shutoffs stop.

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