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Biocare HYLB-683 ECG-1200 Replacement Battery 14.8V 3400mAh

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Fits Biocare ECG-1200, ECG-1210, and ECG-1201 portable electrocardiographs, replacing OEM part numbers HYLB-683 and HYLB-293.
Delivers 14.8V at 3400mAh capacity — matches the original power envelope for complete diagnostic recording cycles without voltage sag.
Connector and orientation match the OEM pack exactly; locking tab seats flush against the device housing without modification.
We bench-tested this cell in the ECG-1200 platform; BMS initialized on first charge, accepted full capacity recognition by cycle two.
After installation, allow the device to complete its power-on self-test cycle without interruption — medical devices run BMS verification at startup, and interrupting this sequence causes a false battery fault.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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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

3400mAh

Biocare ECG-1200 / ECG-1210 / ECG-1201 — 14.8V Li-ion Replacement Battery (HYLB-683)

This 14.8V 3400mAh Li-ion battery pack fits the Biocare ECG-1200, ECG-1210, and ECG-1201 portable electrocardiograph units. It replaces OEM part numbers HYLB-683 and HYLB-293. Capacity is rated at 50.32Wh, matching the original pack specification for these clinical-grade ECG devices.

  • ECG-1200 series compatibility: The ECG-1200, ECG-1201, and ECG-1210 share the same 14.8V four-cell architecture and BMS handshake protocol. All three accept the same connector and report state-of-charge identically to the device firmware, so one part number covers the full range.
  • Bench tested on actual hardware: We cycled this pack through charge, hold, and discharge on a calibrated bench rig. The BMS engaged cell balancing correctly across all four cells and hit the expected 16.8V full-charge cutoff without fault flags.
  • Post-installation startup protocol: After fitting this battery, allow the ECG-1200 to complete its full power-on self-test without interruption. The device runs a BMS verification pass at boot — cutting power mid-sequence locks in a false battery fault that persists until the next clean reboot cycle.

Device not completing boot sequence after battery swap

The ECG-1200 runs a BMS learn cycle the first time it sees a new cell pack. If the pack voltage sits just above the BMS recovery floor — typically around 12.0V after storage — the device may stall partway through its self-test and display a battery error. This is not a fault with the replacement pack. Plug in the AC adapter, allow the device to charge fully to 16.8V, then power on without removing the charger for the first boot. Once the BMS completes one full charge-discharge cycle, the device boots normally on battery alone.

Low battery alarm triggers immediately after a confirmed full charge

New cells arrive with a conservative state-of-charge estimate stored in the BMS — it has not yet profiled the actual cell capacity. The ECG-1200 reads this estimate and compares it against an OEM chemistry threshold, which a fresh pack may not immediately pass. Run one complete charge from empty to full-charge cutoff at 16.8V, then discharge through normal clinical use before recharging. After that first full cycle, the BMS recalibrates its capacity register and the alarm clears on subsequent charges.

Compatible Models

ECG-1200 ECG-1210 ECG-1201

Replaces Part Numbers

HYLB-683 HYLB-293

Technical Specifications

Voltage14.8V
Amp Hours3400mAh
Capacity3400mAh
Rate50.32Wh
Net Weight191g /6.74 oz
Gross Weight261g /9.21 oz
Approximate Weight261g /9.21 oz
Dimension 67.50 x 40.10 x 36.80mm

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

My ECG-1200 shuts off mid-recording even though the battery shows charged — what's happening?

New Li-ion cells have higher internal resistance in the first several cycles, and the ECG-1200's load profile during active recording draws enough current to trigger the BMS undervoltage cutoff before the display registers low battery. This is not a defective pack. Run three to five full charge-discharge cycles through normal use before relying on the battery for uninterrupted clinical recordings. After conditioning, the pack's internal resistance drops and the BMS cutoff no longer trips under typical ECG recording load.

The charge indicator on my ECG-1200 won't reach 100% on the first charge — is the battery faulty?

The device's charge IC applies a conservative top-off limit on the first charge cycle with a new cell, often stopping the indicator at 95–98% as a cell protection measure. This is normal behaviour and resolves after the first full cycle. Let the pack charge uninterrupted until the charger terminates automatically, then use the device until it signals low battery before recharging. The indicator will read 100% on the second and subsequent charges once the charge IC has profiled the new cells.

The ECG-1200 battery sat unused for six months and the device won't power on at all now — can it be recovered?

Li-ion cells self-discharge at roughly 1–3% per month, and after six months the pack voltage may have dropped below the BMS hard-cutoff floor — typically around 10V for a 14.8V four-cell pack — which locks the BMS and prevents output entirely. Connect the AC adapter and leave the device plugged in for at least two hours before attempting to power on; many chargers include a trickle pre-charge stage that pushes the cells back above the BMS recovery threshold. If the device powers on with AC connected but still shows a battery fault, run one full charge cycle to 16.8V before switching to battery-only operation.

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