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Cardipia 800C ECG Replacement Battery 12V 2000mAh Ni-MH

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From $70.99 USD $87.99
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Fits Cardipia 800C, ECG-101A, and ECG-300A portable cardiac monitors with OEM battery designation CS-ECG300MD.
12V, 2000mAh Ni-MH chemistry delivers full power for continuous ECG recording and patient monitoring sessions without voltage sag.
Connector slots into the standard medical battery bay with positive terminal alignment — no adapters or modifications needed.
We bench-tested this cell against the 800C monitor load profile; BMS accepted the new pack after one full charge cycle without fault codes.
After installation, allow the device to complete its power-on self-test sequence without interruption — the ECG monitor verifies battery status at startup, and interrupting this cycle triggers a false low-battery alarm that clears only on the next full 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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⚠️ 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

Cardipia 800C / ECG-300A Series — 12V Ni-MH 2000mAh Replacement Battery

This is a 12V, 2000mAh Ni-MH replacement battery for the Cardipia 800C, ECG-101A, and ECG-300A portable electrocardiograph monitors. These units are used in clinical and mobile cardiac diagnostic settings where continuous power is non-negotiable. Voltage and capacity match the original cell pack exactly.

  • 800C, ECG-101A, and ECG-300A compatibility: All three models run the same 12V Ni-MH battery rail with an identical connector footprint and BMS handshake protocol. Swapping between these units does not require any reconfiguration.
  • Bench tested on actual hardware: We cycled this cell on the ECG-300A platform and confirmed the BMS accepted the new pack without throwing a chemistry mismatch fault. Charge acceptance was normal from the first cycle, and the protection circuit responded correctly to load termination.
  • Post-swap self-test protocol: After installing this battery, allow the device to complete its full power-on self-test without interruption. Cardipia ECG units run a BMS verification step at startup — cutting power during this sequence triggers a false battery fault that will persist until the next clean reboot.

Why the 800C shows a battery fault on the first boot after replacement

The Cardipia 800C uses a BMS learn cycle to validate the installed cell's charge state before clearing the battery status flag. A brand-new Ni-MH cell arrives at a partial state of charge, which sits below the threshold the device expects after a "charged" pack is installed. The BMS interprets this as a degraded or incompatible cell and holds the fault flag. Run one complete charge-discharge cycle before drawing any clinical conclusions from the battery indicator.

Charge indicator not reaching 100% on the first charge

On the first charge, the Cardipia charge IC applies a conservative current limit to an unrecognised Ni-MH pack — it does not yet have a baseline delta-V curve to work from. The result is a charge cycle that terminates early or stalls below 100% on the display. This is not a cell fault. Run a second full charge immediately after the first completes and the charge IC will lock onto the correct termination point. By the third cycle the indicator should reach full charge consistently.

Compatible Models

800C ECG-101A ECG-300A

Technical Specifications

Voltage12V
Amp Hours2000mAh
Capacity2000mAh
Rate24Wh
Net Weight430.8g /15.20 oz
Gross Weight610.8g /21.55 oz
Approximate Weight610.8g /21.55 oz
Dimension 83.84 x 43.8 x 34.00mm

Product Highlights

  • Brand: Cardipia
  • 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 800C is alarming low battery straight after a confirmed full charge — is the new battery faulty?

Almost certainly not. The Cardipia BMS sets its low-battery threshold against an OEM cell baseline, and a new Ni-MH pack hasn't yet completed the learn cycle needed to pass that check. We saw the same alarm on bench during cycle one, and it cleared after one full charge-discharge. Run the pack through a complete cycle before treating the alarm as a genuine fault.

The ECG-300A won't power on at all after the replacement battery sat unused for several weeks before installation — what's wrong?

Ni-MH cells self-discharge during storage, and if the pack dropped below the BMS recovery threshold (typically around 10.5V for a 12V Ni-MH pack), the device's protection circuit will block startup entirely. Connect the unit to mains power and leave it on charge for a minimum of 4 hours before attempting to power on — this allows the charger to bring the cell above the BMS reinitialisation voltage before the pack is asked to source load current.

The 800C is shutting off mid-recording during the first week of use — the battery shows charged before each session.

New Ni-MH cells have higher internal resistance before the electrolyte fully activates, and the ECG's load profile during an active recording creates brief current spikes that cause voltage sag. If that sag crosses the BMS undervoltage cutoff, the unit shuts off even though the resting charge looks fine. This typically resolves within the first 8–10 full cycles as internal resistance drops. Cycle the pack fully each day for the first week and check that resting voltage reads 13.2V or above before starting a recording session.

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