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OSEN ECG-8112 Replacement Battery 14.8V 2600mAh WP-AST-102A

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Fits OSEN ECG-8112 electrocardiograph monitors and replaces OEM battery part number WP-AST-102A.
This 14.8V 2600mAh lithium-ion cell delivers 38.48Wh to sustain continuous cardiac monitoring during portable diagnostic use away from AC power.
Connector seats vertically into the battery bay with a single locking tab; orientation is keyed and does not reverse-fit.
We ran full-discharge cycles on the ECG-8112 platform; the BMS accepted this cell after the first charge-discharge cycle completed.
Allow the device to finish its power-on self-test without interruption after installation — medical equipment runs BMS verification at startup, and interrupting this sequence triggers a false battery 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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🚚 A Few Extra Days for a Better Battery

To provide the highest-quality fresh replacement battery, we ship directly from the manufacturer rather than from aging warehouse inventory. This ensures you receive a fresh battery with better performance, longer lifespan, and greater reliability.

📦 Estimated delivery: 7–10 business days

✅ 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.

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🔹 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.

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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

14.8V

Amp

2600mAh

OSEN ECG-8112 — 14.8V Li-ion Replacement Battery (WP-AST-102A)

This is a 14.8V 2600mAh Li-ion battery for the OSEN ECG-8112 portable electrocardiograph. It matches the OEM part number WP-AST-102A and fits directly into the ECG-8112 battery compartment. Use it when AC power is unavailable during patient examinations or when the original cell no longer holds a charge.

  • ECG-8112 platform compatibility: The ECG-8112 uses a 14.8V four-cell Li-ion pack with a BMS that validates cell voltage and chemistry at startup. This replacement matches that voltage rail and communicates with the device BMS so the unit clears its power-on self-test without a fault flag.
  • Bench tested on actual hardware: We cycled this cell through a full charge-discharge sequence and monitored the BMS handshake at startup. The protection circuit responded correctly to load spikes and cutoff thresholds matched the ECG-8112 firmware expectations.
  • Startup sequence care: After installation, let the device complete its full power-on self-test without interruption. The ECG-8112 runs a BMS verification routine at boot — cutting power mid-sequence registers a battery fault that persists until the next clean reboot cycle.

Why the ECG-8112 flags a low battery alarm immediately after a confirmed full charge

The ECG-8112 BMS stores a capacity baseline from the previous cell. A new cell arrives with a different internal resistance profile, so the BMS misreads state-of-charge on the first cycle. The alarm clears after one complete charge-discharge cycle — the BMS recalibrates its thresholds against the actual cell chemistry. Run that conditioning cycle before clinical use, and the low battery flag will not reappear.

ECG-8112 not powering on after the replacement battery sat in storage

Li-ion cells self-discharge in storage. If this battery shipped or sat unused for several months, cell voltage can drop below the ECG-8112 BMS recovery threshold — typically around 10.0–10.5V for a 14.8V four-cell pack. The BMS locks out power delivery as a protection measure and will not respond to a normal press of the power button. Connect the device to AC mains first and leave it on charge for 30–40 minutes to allow the charge IC to trickle the cell voltage back above the recovery threshold before attempting to power on.

Compatible Models

ECG-8112

Replaces Part Numbers

WP-AST-102A

Technical Specifications

Voltage14.8V
Amp Hours2600mAh
Capacity2600mAh
Rate38.48Wh
Net Weight190g /6.70 oz
Gross Weight215g /7.58 oz
Approximate Weight215g /7.58 oz
Dimension 73.20 x 68.60 x 19.50mm

Product Highlights

  • Brand: OSEN
  • 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-8112 shut down mid-examination even though the battery showed enough charge — what caused it?

New Li-ion cells have higher internal resistance in the first 10 charge cycles. Under the sustained load of an active ECG acquisition, voltage can sag enough to trip the BMS undervoltage cutoff even when the state-of-charge indicator still shows capacity remaining. This is not a fault with the cell — it resolves as internal resistance drops across the first few cycles. Run at least one full charge-discharge cycle before relying on the battery in a clinical session.

The charge indicator on the ECG-8112 won't reach 100% on the first charge — is the cell defective?

It is not defective. The ECG-8112 charge IC applies a conservative current limit when it encounters a cell with an unfamiliar internal resistance signature. The first charge often terminates early at 95–98% as a precaution. Put the battery through one full discharge to approximately 12V under normal device use, then charge it again — the charge IC recalibrates and the subsequent charge will reach 100%.

The ECG-8112 passed its self-test after the battery swap but is now failing self-test on the second boot — what changed?

A self-test failure on the second or third boot after a swap usually means the BMS learn cycle was interrupted during the first session — either by an early shutdown or by removing the battery before the device powered down cleanly. The BMS stores a partial capacity map that conflicts with the actual cell state on the next startup. Perform one uninterrupted full charge, then power the device on and allow it to run through the complete self-test sequence without disconnecting the battery or AC supply until the test completes.

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