About this replacement
Chison ECO 1 / ECO 2 Portable Ultrasound — 14.4V Li-ion Replacement Battery (33-00012-00)
This 14.4V 6800mAh Li-ion battery replaces part number 33-00012-00 (also cross-referenced as BT-2500) in Chison ECO 1 and ECO 2 portable ultrasound systems. It supports mobile clinical imaging when mains power is unavailable. Voltage and capacity match OEM specification exactly — 97.92Wh total energy.
- ECO 1 and ECO 2 platform compatibility: Both the ECO 1 and ECO 2 share the same battery bay dimensions, connector pinout, and BMS communication protocol. The 14.4V nominal rail and cell configuration are identical across the platform, so this single part number covers all listed variants without modification.
- Bench tested on actual hardware: We ran this cell through charge-discharge cycles on the ECO platform and confirmed the BMS handshake completes correctly. Charge termination triggers at the expected cutoff voltage, and the protection circuit responds to overcurrent as it should during probe activation.
- Power-on self-test protocol: After installing this battery, allow the ECO unit to complete its full startup self-test without interruption. The device runs a BMS verification sequence at boot — cutting power mid-sequence triggers a false battery fault that persists until the next clean reboot cycle.
ECO 1 not completing boot sequence after battery swap
The ECO 1 runs a hardware self-test during boot that includes a BMS state-of-charge query. On a new cell, the BMS may not yet have a calibrated charge history, and the device can interpret an ambiguous response as a fault — halting the boot sequence before the imaging software loads. This is not a defective battery. Perform one full charge cycle from near-empty to 100%, then reboot. The BMS log populates correctly on the second cycle and the device completes startup normally.
Low battery alarm triggers immediately after a confirmed full charge
This alarm appears when the BMS threshold is calibrated to OEM cell chemistry and the replacement cell hasn't yet passed its first full charge-discharge learn cycle. The device reads state-of-charge from coulomb counting, and a new cell with no cycle history can report a lower-than-actual value. Run one complete discharge under normal clinical load followed by a full charge to 100%. After that cycle the BMS recalibrates its baseline and the alarm clears.