About this replacement
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.