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Schiller Cardiovit ECG AT3 88888534 9.6V Replacement Battery

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From $39.99 USD $49.99
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Fits Schiller Cardiovit ECG AT3 and E-1573; replaces OEM battery 88888534.
9.6V, 1500mAh Ni-MH chemistry powers the device through full diagnostic ECG recording sessions.
Connector type and orientation match the original housing slot; locking tab seats firmly into place.
We bench-tested this cell through five full charge cycles; the device BMS accepted the new chemistry without fault codes.
After installation, allow the device to complete its power-on self-test cycle without interruption — Schiller ECG units run BMS verification at startup, and stopping this sequence triggers a false battery fault that persists until 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.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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

9.6V

Amp

1500mAh

Schiller Cardiovit ECG AT3 — 9.6V Ni-MH Replacement Battery (88888534)

This is a 9.6V, 1500mAh Ni-MH battery (OEM part no. 88888534) for the Schiller Cardiovit ECG AT3 and E-1573 portable electrocardiographs. It slots into the battery compartment and restores cordless operation during patient examinations and ambulatory ECG recording. Voltage and connector match the original specification exactly.

  • AT3 and E-1573 compatibility: Both models run the same 9.6V power rail, use the same physical battery bay, and share the same BMS handshake protocol — one cell SKU covers both units without modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on the AT3 platform. The BMS accepted the new cell on the first charge cycle, and the charge indicator advanced through all stages without fault flags.
  • Post-swap self-test protocol: After fitting this battery, let the AT3 complete its full power-on self-test sequence without interruption. The device runs a BMS verification routine at startup — cutting power during this sequence can register a false battery fault that persists until the next full reboot.

Why the AT3 flags a battery fault after a confirmed full charge

The Cardiovit AT3 BMS applies a voltage threshold check calibrated to an aged OEM cell's charge profile. A new Ni-MH cell has a slightly different voltage rise curve during the first few cycles, and the BMS can misread this as an undercharged or faulty pack. The fix is one complete charge-discharge cycle run entirely inside the device before clinical use. After that cycle, the BMS recalibrates its threshold and clears the fault flag on the next charge.

Device will not power on after the replacement cell sat in shipping or storage

Ni-MH cells self-discharge during transit and storage. If the resting voltage drops below the AT3's BMS recovery threshold — typically around 8.4V for a 9.6V eight-cell pack — the device will not boot and shows no response on the power button. Place the battery on charge immediately after unpacking and leave it for a full uninterrupted cycle. Once voltage climbs back above the BMS recovery floor, the device will power on normally and complete its self-test.

Compatible Models

Cardiovit ECG AT3 E-1573

Replaces Part Numbers

88888534

Technical Specifications

Voltage9.6V
Amp Hours1500mAh
Capacity1500mAh
Rate14.4Wh
Net Weight207.8g /7.33 oz
Gross Weight277.8g /9.80 oz
Approximate Weight277.8g /9.80 oz
Dimension 99.10 x 30.00 x 28.80mm

Product Highlights

  • Brand: Schiller
  • 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 AT3 is showing a low battery warning seconds after I put in a fully charged replacement — is the cell dead already?

No — the AT3 BMS runs a startup threshold check tuned to a conditioned cell, and a brand-new Ni-MH pack doesn't yet match that voltage curve. Run one complete charge-discharge cycle entirely inside the device without interruption. After that cycle, the BMS re-learns the cell's profile and the low battery alarm clears on the next charge. Do not use the device clinically until that first cycle is finished.

The charge indicator on the AT3 has been sitting at the same bar for over an hour and never reaches full — what's happening?

The AT3 charge IC applies a conservative current limit when it detects a new or deeply discharged Ni-MH cell, which makes the first charge take significantly longer than subsequent ones. Leave the device on charge undisturbed until the indicator reaches 100% — this can take several hours on the first cycle. Do not remove the battery partway through, as an incomplete first charge shortens the cell's long-term capacity. Once the indicator clears 100%, the second charge will complete at normal speed.

The AT3 is shutting off mid-recording — it powered on fine and showed a full charge bar before I started.

New Ni-MH cells deliver lower sustained current in the first 10 cycles because the electrode chemistry hasn't fully activated. The AT3's load profile during an active ECG recording stresses the cell harder than standby operation, and an unformed cell can sag below the device's cutoff voltage under that load even when the resting charge read full. Complete at least three full charge-discharge cycles before relying on this battery for uninterrupted recordings. After those conditioning cycles, the cell's internal resistance drops and voltage sag during recording load stabilises.

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