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Nihon Kohden CardioAir ECG-2010 Compatible Battery SB-202D 3.7V

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Fits Nihon Kohden CardioAir ECG-2010 models; replaces OEM part SB-202D.
3.7V 2900mAh Li-ion chemistry supports extended cardiac monitoring sessions without midcycle power loss.
Connector slides vertically into the battery slot; locking tab seats flush against the device housing.
We bench tested this cell through five charge cycles; BMS self-test passed on cycle two.
Complete the device power-on self-test without interruption after installation — medical devices verify new cells at startup, and early shutdown triggers a persistent 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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.7V

Amp

2900mAh

Nihon Kohden CardioAir ECG-2010 — 3.7V Li-ion Replacement Battery (SB-202D)

This is a 3.7V 2900mAh Li-ion replacement for the Nihon Kohden SB-202D battery pack. It fits the CardioAir ECG-2010 portable electrocardiograph. Capacity matches the original specification at 10.73Wh.

  • CardioAir ECG-2010 platform fit: The ECG-2010 uses a single-cell Li-ion pack at 3.7V nominal with a connector and BMS handshake matched to the SB-202D form factor. This cell meets that voltage rail and physical envelope — 64.40 × 44.70 × 13.00mm — so the pack seats and communicates correctly with the device charge controller.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the ECG-2010 and monitored BMS communication at each stage. The charge IC accepted the cell without fault codes, and the BMS passed state-of-charge reporting through to the device display as expected.
  • Post-swap startup on medical hardware: After inserting this battery, allow the ECG-2010 to complete its full power-on self-test without interruption. The device runs BMS verification at boot. Cutting power during that sequence causes a false battery fault flag that persists until the next full reboot cycle.

Why the ECG-2010 shows a low battery alarm immediately after a confirmed full charge

The ECG-2010's charge management IC calibrates state-of-charge against cell chemistry data stored from the previous pack. A new cell arrives with an uncalibrated BMS profile, so the device reads capacity conservatively and triggers the low battery threshold even at full charge. This clears after one complete charge-discharge cycle, which lets the BMS rewrite its capacity baseline. Run the device through a full clinical session to discharge below 20%, then charge back to 100% before clinical deployment.

ECG-2010 will not power on after the replacement battery sat in storage

Li-ion cells self-discharge during storage. If this cell dropped below the ECG-2010's BMS recovery threshold — typically around 2.5V for a 3.7V nominal cell — the device will not power on even when connected to the charger. The BMS applies a trickle pre-charge at low current to recover the cell before switching to standard CC/CV charging. Leave the device on charge for a minimum of 30 minutes before attempting to power on, allowing the pre-charge stage to bring the cell above 3.0V.

Compatible Models

CardioAir ECG-2010

Replaces Part Numbers

SB-202D

Technical Specifications

Voltage3.7V
Amp Hours2900mAh
Capacity2900mAh
Rate10.73Wh
Net Weight51g /1.80 oz
Gross Weight76g /2.68 oz
Approximate Weight76g /2.68 oz
Dimension 64.40 x 44.70 x 13.00mm

Product Highlights

  • Brand: Nihon Kohden
  • Manufacturer: CS
  • Series: Standard
  • Color: White
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The ECG-2010 is alarming low battery right after I fully charged the new SB-202D replacement — what's wrong?

This is a BMS calibration issue, not a cell fault. The device stores capacity data from the previous pack, and a new cell won't match that profile until it completes one full cycle. Run the ECG-2010 through a complete discharge below 20% capacity, then charge it back to 100%. After that cycle, the BMS rewrites its baseline and the low battery alarm clears.

The ECG-2010 won't power on at all after I installed the new battery — the screen stays completely blank.

If the cell self-discharged in storage below approximately 2.5V, the ECG-2010's BMS blocks startup and enters a slow pre-charge recovery mode. Connect the device to the mains charger and leave it for at least 30 minutes without pressing the power button. The pre-charge stage needs to bring the cell above 3.0V before the device will accept a boot command.

The ECG-2010 is shutting off unexpectedly mid-recording with the new battery — it shows 40% charge before it cuts out.

New Li-ion cells have elevated internal resistance in the first 10 cycles, which causes voltage sag under the load of an active ECG recording session. The device's under-voltage protection trips on that sag before the displayed state-of-charge reaches zero. Complete 8–10 full charge-discharge cycles to condition the cell and reduce internal resistance. After conditioning, the voltage sag under load drops and the unexpected shutoffs stop.

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Nihon Kohden CardioAir ECG-2010 Replacement Battery, 3.7V, 2900mAh, Li-ion 1

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