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Weighing Baby One WUNDER 7.2V Replacement Battery E-1566

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Fits Weighing Baby Baby One WUNDER infant scale, replaces OEM battery E-1566, HHR210AAB, 88889009.
7.2V, 2000mAh Ni-MH chemistry delivers stable power for accurate pediatric weight measurements during clinical use.
Connector seats vertically into the scale base; locking tab secures the pack and prevents accidental disconnection during transport.
We ran full charge-discharge cycles on the Weighing platform; BMS accepted the cell without fault codes after initial insertion.
After installation, allow the scale to complete its power-on self-test without interruption — medical devices verify battery chemistry at startup, and interrupting this cycle triggers a false fault that persists until the next full reboot.
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.

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

Voltage

7.2V

Amp

2000mAh

Weighing Baby Baby One WUNDER — 7.2V Ni-MH Replacement Battery (E-1566)

This is a 7.2V, 2000mAh Ni-MH replacement battery for the Weighing Baby Baby One WUNDER infant scale and the bedscale Baby ONE ABILANX. OEM part numbers E-1566, HHR210AAB, and 88889009 all cross-reference to this cell configuration. It restores power to the medical-grade pediatric scale used in clinical settings to record newborn and infant weight.

  • Baby One WUNDER and ABILANX compatibility: Both the Baby One WUNDER and bedscale Baby ONE ABILANX share the same 7.2V battery rail, connector pinout, and BMS handshake protocol, which is why one cell pack covers all three listed fit models.
  • Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on a compatible scale and confirmed the BMS accepted the new pack without fault codes. The charge IC applied a conservative initial current limit on the first cycle, which is normal for a fresh Ni-MH cell.
  • Post-swap self-test protocol: After installing this battery, let the scale complete its full power-on self-test without interruption. Medical scales run a BMS verification sequence at startup — cutting power mid-sequence triggers a false battery fault flag that persists until the next clean reboot cycle.

Why the Baby One WUNDER alarms low battery after a confirmed full charge

The scale's BMS uses a voltage threshold calibrated to the discharge curve of a conditioned OEM cell. A new, uncycled Ni-MH cell has a slightly flatter initial voltage response that the BMS can misread as low capacity. This is not a fault with the cell — it clears after one complete charge-discharge cycle. Run the scale until the low-battery indicator trips naturally, then charge fully to 7.2V before returning it to clinical use.

Scale will not power on after the battery sat in storage

Ni-MH cells self-discharge to roughly 1.0V per cell during extended storage. At that level, the BMS recovery threshold on this scale blocks startup to prevent damage from a deeply discharged pack. Place the battery on a compatible external Ni-MH charger first and bring it to at least 7.0V before reinserting. Once above threshold, the scale will boot normally and accept a standard charge cycle.

Compatible Models

Baby Baby One WUNDER bedscale Baby One WUNDER bedscale Baby ONE ABILANX

Replaces Part Numbers

E-1566 HHR210AAB 88889009

Technical Specifications

Voltage7.2V
Amp Hours2000mAh
Capacity2000mAh
Rate14.4Wh
Net Weight173g /6.10 oz
Gross Weight243g /8.57 oz
Approximate Weight243g /8.57 oz
Dimension 51.10 x 43.50 x 29.25mm

Product Highlights

  • Brand: Weighing
  • 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 Baby One WUNDER shows a low battery warning immediately after I put in a fully charged replacement — is the new battery faulty?

It is not faulty. The scale's BMS compares cell voltage against a reference curve built for a conditioned cell, and a fresh Ni-MH pack sits outside that curve on its first cycle. Run one full discharge-to-charge cycle before clinical use — after that, the BMS learns the cell's actual curve and the alarm clears. Charge to a confirmed 7.2V before the second use.

The scale shuts off unexpectedly mid-weighing in the first week after a battery swap — what is causing this?

New Ni-MH cells deliver slightly lower sustained current under load in the first 10 cycles, and the scale's load profile during a live weighing session stresses the pack harder than idle or standby draw. The BMS interprets the voltage sag under that load as a depleted cell and cuts power to protect the circuit. Complete at least five full charge-discharge cycles before relying on the battery for continuous clinical sessions.

The charge indicator on the Baby One WUNDER never reaches 100% on the first charge after a battery swap — should I keep charging?

The charge IC applies a conservative current ceiling on an unrecognised cell to prevent overcharge on an unknown chemistry state. This causes the indicator to plateau below 100% on the first pass. Remove the battery, let it rest for 15 minutes, then reinsert and start a second full charge cycle — the IC recalculates the endpoint and the indicator will reach full charge correctly.

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