About this replacement
Nihon Kohden Edan SE-300A / SE-300B — 14.4V Li-ion Replacement Battery
This 14.4V 2600mAh Li-ion battery replaces the internal power cell in the Edan SE-300A and SE-300B portable electrocardiograph. Both devices are 12-lead ECG machines used in clinical, ambulatory, and emergency settings. Voltage and capacity match OEM specifications for these two models.
- SE-300A and SE-300B compatibility: Both the SE-300A and SE-300B share the same 14.4V battery bay, connector pinout, and BMS communication protocol. A single cell services either unit without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the SE-300A platform. The BMS handshake completed on the first cycle, charge termination triggered correctly at full capacity, and the device reported battery status accurately in its diagnostics menu.
- Post-installation self-test: After fitting this battery, allow the SE-300A or SE-300B to complete its full power-on self-test without interruption. The BMS runs a verification sequence at startup — cutting power mid-sequence causes a false battery fault that persists until the next clean reboot.
Why the SE-300A reports low battery immediately after a confirmed full charge
The SE-300A's BMS uses stored charge-curve data calibrated to the original cell's chemistry profile. A new cell has not yet established a matching charge signature, so the BMS reads the state-of-charge conservatively and triggers a low-battery alert even when the cell is full. This behaviour typically clears after one complete charge-discharge cycle. Run a full charge to termination, then allow the device to run normally until the BMS initiates a protection cutoff, then recharge fully before clinical use.
Device fails to power on after the replacement battery sat in storage
Li-ion cells self-discharge during storage. If voltage drops below approximately 10V, the SE-300A's BMS enters deep-discharge protection and blocks power output entirely — the device appears completely dead. Connect the charger and leave it for a minimum of 30 minutes before attempting to power on. The charge IC will trickle-charge the cell back above the BMS recovery threshold, typically around 11.0V, at which point normal charging resumes and the device will boot.