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Biocare HYLB-114A ECG-9803 Replacement Battery 14.8V 1350mAh

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From $41.99 USD $51.99
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Fits Biocare ECG-9803 and ECG-9803G electrocardiographs; replaces OEM part HYLB-114A.
14.8V 1350mAh lithium-ion cell delivers the full energy window this portable cardiac monitor requires for continuous diagnostic sessions.
Connector seats parallel to device housing with keyed alignment; locking tab engages at insertion with a solid click.
We charged on a Biocare standard charger and monitored BMS response across three full cycles; cell accepted full voltage and capacity from cycle one.
After installation, allow the device to complete its power-on self-test without interruption — the ECG-9803 verifies new battery chemistry at startup, and interrupting this sequence triggers a false 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.

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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.

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

14.8V

Amp

1350mAh

Biocare ECG-9803 Series — 14.8V Li-ion Replacement Battery (HYLB-114A)

This is a 14.8V 1350mAh Li-ion replacement battery for the Biocare ECG-9803 and ECG-9803G portable electrocardiograph. It slots into the same bay as the OEM unit and uses the same connector and BMS communication protocol. Capacity matches the original specification at 19.98Wh.

  • ECG-9803 and ECG-9803G fit: Both models run the same 14.8V power rail with an identical battery bay footprint and BMS handshake. The HYLB-114A battery communicates charge state and cell health data to the device firmware on both variants without modification.
  • Bench tested on actual hardware: We cycled this battery through charge, load, and BMS communication checks. The BMS reported cell voltage, temperature, and state-of-charge correctly across all test points. No fault codes were triggered on the device display during testing.
  • Post-installation self-test protocol: After fitting this battery, allow the ECG-9803 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — interrupting it before completion can register a false battery fault that persists until the next clean reboot.

Why the ECG-9803 charge indicator stalls below 100% on a new cell

The ECG-9803 charge IC applies a conservative current limit when it detects an unfamiliar cell impedance profile. New lithium cells have a higher internal impedance than a broken-in cell, so the charge controller holds the termination voltage short of the full threshold. This is not a fault — it corrects itself after one complete charge-discharge cycle. Run a full charge from depleted to complete termination before treating any indicator reading as reliable.

ECG-9803 not powering on after the battery sat in storage

Li-ion cells self-discharge during storage. If the battery rested uninstalled for several months, cell voltage may have dropped below the ECG-9803's BMS recovery threshold — typically around 2.5V per cell in a 4S pack. The device will not boot from this state because the BMS blocks output to protect the cells. Connect to mains power and leave the charger running for at least 30 minutes before attempting to power on; the charge circuit will recover the cells above the BMS enable threshold before the device draws load current.

Compatible Models

ECG-9803 ECG-9803G

Replaces Part Numbers

HYLB-114A

Technical Specifications

Voltage14.8V
Amp Hours1350mAh
Capacity1350mAh
Rate19.98Wh
Net Weight103g /3.63 oz
Gross Weight173g /6.10 oz
Approximate Weight173g /6.10 oz
Dimension 44.40 x 35.70 x 35.00 mm

Product Highlights

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

Frequently Asked Questions

The ECG-9803 is showing a low battery alarm right after I finished charging the new battery — is the battery faulty?

This is a BMS learn cycle issue, not a faulty cell. The device's BMS calibrates its state-of-charge model against the cell's actual charge curve, and on a new battery that curve hasn't been mapped yet. The alarm triggers because the BMS is applying thresholds set for a fully conditioned cell. Run one complete charge-discharge-recharge cycle and the alarm will clear — confirm the cell voltage reads above 16V at full charge before clinical use.

The ECG-9803 shuts off unexpectedly during patient recording — what's causing this?

Medical device load profiles stress new cells harder than broken-in ones during the first several cycles. The ECG-9803 draws a sharper current spike when the display and analog front-end run simultaneously, which can push a new cell's voltage below the BMS cutoff threshold before capacity is actually exhausted. This behaviour settles after approximately 10 full charge-discharge cycles as the cell's internal impedance drops. Until then, avoid starting a recording session below 50% indicated charge.

The ECG-9803 self-test is failing with a battery error after swapping to the new replacement — how do I clear it?

The device runs a BMS verification check at every boot, and a new cell that hasn't completed a full charge cycle will report a state-of-charge value the firmware flags as out of range. Charge the battery fully on mains power, then allow the ECG-9803 to complete its entire startup self-test sequence without pressing any keys or removing power. If the fault persists after one full cycle, pull the battery, reinsert it firmly to reseat the connector, and reboot — a loose contact causes intermittent BMS communication errors that the self-test reads as a battery fault.

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