Burdick SE-1200 Express EKG TWSLB-004 14.4V Compatible Battery

Burdick SE-1200 Express EKG — 14.4V Li-ion Replacement Battery (TWSLB-004)

This 14.4V, 5200mAh (74.88Wh) Li-ion battery is a direct replacement for the Burdick SE-1200 Express portable 12-lead electrocardiograph. It matches the original voltage rail and connector configuration required by the SE-1200 Express power system. Sourced to OEM spec against part number TWSLB-004.

• SE-1200 Express platform fit: The SE-1200 Express uses a 14.4V battery rail with a BMS handshake that communicates cell chemistry and charge state to the device firmware. This replacement cell meets that voltage requirement and communicates correctly with the onboard charge IC, preventing false fault flags during startup.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the SE-1200 Express platform. The BMS completed its verification sequence without fault, and the charge IC accepted the cell through a full charge curve to 16.8V cutoff.
• Post-swap startup protocol: After installing this battery, allow the SE-1200 Express to complete its power-on self-test cycle without interruption. The device runs a BMS verification at startup — cutting power mid-sequence triggers a false battery fault that persists until the next clean reboot.

Why the SE-1200 Express alarms low battery on a freshly charged replacement

The SE-1200 Express BMS uses a learned capacity model calibrated to the original cell's discharge curve. A new cell with no cycle history doesn't match that model on the first charge, so the device reads state-of-charge conservatively and triggers the low battery threshold prematurely. This is not a fault with the replacement cell. Run one complete charge-discharge cycle before clinical use — after that cycle, the BMS recalibrates its capacity estimate against the new cell and the alarm clears.

SE-1200 Express fails to power on after battery sat in storage

Li-ion cells self-discharge over time, and if a stored battery drops below the BMS recovery threshold — typically around 2.5V per cell, or roughly 10V at pack level for a 4S configuration — the protection circuit locks out the charge path entirely. The device won't respond and shows no charge indicator activity. Connect the battery to the Burdick charger and leave it undisturbed for at least 30 minutes. Most BMS controllers have a trickle-charge recovery mode that runs below the main charge enable threshold and will bring the pack back up to a level where normal charging resumes.