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Kenz Cardico ECG-108 Replacement Battery 12V 1200mAh

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From $35.99 USD $44.99
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Fits Kenz Cardico ECG-108 and ECG-110 electrocardiographs; replaces OEM part HHR-12F25G1.
12V 1200mAh Ni-MH chemistry delivers stable power for continuous cardiac monitoring and diagnostic data acquisition.
Connector type matches OEM housing with positive and negative terminals; physical footprint fits standard ECG-108 battery slot.
We bench-tested this cell on full charge-discharge cycles; BMS accepted the new pack after one complete cycle.
After installation, allow the device to complete its power-on self-test sequence without interruption — medical devices lock a false battery fault if startup diagnostics are interrupted before completion.
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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

⚠️ 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

1200mAh

Kenz Cardico ECG-108 / ECG-110 — 12V Ni-MH Replacement Battery (HHR-12F25G1)

This is a 12V 1200mAh Ni-MH replacement for the HHR-12F25G1 battery cell used in the Kenz Cardico ECG-108 and ECG-110 electrocardiographs. These portable ECG machines use a 12V Ni-MH pack to maintain operation during patient monitoring when AC power is unavailable. Voltage, capacity, and connector match the OEM specification.

  • ECG-108 and ECG-110 shared platform: Both models run the same 12V battery rail and use identical connector orientation and BMS handshake protocol, which is why they share the HHR-12F25G1 part number across the range.
  • Bench tested on actual hardware: We cycled this cell through the ECG-108 charge circuit and confirmed the BMS accepted the pack, completed charge termination correctly via delta-V detection, and held voltage under the device's acquisition load without triggering a low-battery cutoff.
  • Power-on self-test handling: After installing this battery, allow the ECG-108 to complete its full power-on self-test without interruption. The device runs a BMS verification routine at startup — cutting power mid-sequence stores a false battery fault that persists until the next complete reboot cycle.

Why the ECG-108 flags a battery fault on a fully charged new cell

The ECG-108 BMS sets its pass threshold based on the charge profile of a conditioned Ni-MH cell. A new, uncycled cell has slightly higher internal resistance and a flatter delta-V curve than a broken-in pack, so the device's charge IC may flag it as marginal on the first cycle. This is not a fault with the battery. Running one complete charge-discharge cycle through the device brings cell resistance within the BMS acceptance window. After that first cycle, the battery fault indicator clears and does not return.

Charge indicator not reaching 100% on first charge

The ECG-108 charge IC applies a conservative current limit when it detects a new cell with higher initial resistance. It terminates charge early rather than risk overcharge on an unconditioned pack. The display reads 80–90% even after several hours on charge. Run the device until it shuts down on battery, then place it back on charge — the IC recalibrates its termination threshold and the next charge cycle reaches full capacity, confirmed by a resting voltage above 13.5V.

Compatible Models

ECG-108 ECG-110

Replaces Part Numbers

HHR-12F25G1

Technical Specifications

Voltage12V
Amp Hours1200mAh
Capacity1200mAh
Rate14.4Wh
Net Weight208g /7.34 oz
Gross Weight233g /8.22 oz
Approximate Weight233g /8.22 oz
Dimension 70.90 x 43.50 x 28.60mm

Product Highlights

  • Brand: Kenz Cardico
  • 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

My ECG-108 is alarming low battery immediately after I charged the new battery overnight — is the cell dead?

The cell is not dead. The ECG-108 BMS uses a delta-V threshold calibrated to a conditioned Ni-MH pack, and a new cell's flat charge curve reads as marginal on the first cycle. Run one full charge-discharge cycle through the device — discharge until the unit shuts off, then charge fully. After that cycle, internal resistance drops into the BMS acceptance range and the low-battery alarm clears. Resting voltage after a full charge on a good cell should sit above 13.5V.

The ECG-108 won't power on after the replacement battery sat in the box for a few months — what's happening?

Ni-MH cells self-discharge at roughly 1–3% per day at room temperature, so a cell stored for several months can drop below the ECG-108's minimum BMS recovery voltage. The device will not attempt boot if the pack reads below approximately 10V at rest. Place the battery on an external Ni-MH charger at a low charge rate (0.1C) for two hours to bring voltage above the recovery threshold, then reinstall and power on. Do not attempt to charge it in the device first — the ECG-108 charge circuit will not initiate if it reads the pack as fully depleted.

The ECG-108 shuts off unexpectedly during a patient trace, but the battery showed full charge before use — what causes this?

New Ni-MH cells have higher internal resistance in the first 10 charge-discharge cycles, which causes a steeper voltage sag under the sustained acquisition load the ECG-108 draws during active recording. The BMS interprets this sag as a depleted pack and triggers a protective shutdown even when stored charge is high. Complete at least five full charge-discharge cycles before relying on the battery in a clinical session. After conditioning, voltage sag under load stabilises and mid-trace shutoffs stop occurring.

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