About this replacement
Chison ECO 1 / ECO 2 Portable Ultrasound — 14.4V Li-ion Replacement Battery (33-00012-00)
This 14.4V 5200mAh (74.88Wh) lithium-ion battery replaces the Chison OEM part 33-00012-00 (also listed as BT-2500) in the ECO 1 and ECO 2 portable ultrasound systems. It fits both the standard ECO 1 and ECO 2 units, along with six additional Chison portable ultrasound configurations sharing the same battery bay and connector. Voltage and cell count match the original pack exactly.
- ECO 1 and ECO 2 platform fit: Both the ECO 1 and ECO 2 share the same 14.4V battery rail, connector pinout, and BMS communication protocol. One replacement cell covers the full platform — no wiring changes or adapter needed.
- Bench tested on actual hardware: We cycled this pack through full charge and discharge on ECO-series hardware. The BMS handshake completed without fault codes, and the device passed its power-on self-test on the first boot after installation.
- Post-swap startup protocol: After installing this battery, let the ECO unit complete its full power-on self-test without interrupting it. The device runs a BMS verification sequence at boot — cutting power during that window triggers a battery fault flag that persists until the next complete reboot.
Why the ECO 1 reports a battery fault after a confirmed full charge
The ECO 1's BMS stores a capacity model calibrated to the original cell chemistry. A new replacement cell has not yet built a charge history that the BMS recognises, so the system can flag a fault or display an inaccurate state-of-charge reading even when the pack is physically full. This resolves after one complete charge-to-discharge cycle, which gives the BMS enough data to update its internal model. Do not use the unit clinically until that first cycle is complete and the self-test passes cleanly.
ECO 1 shuts off mid-scan during the first few uses
New lithium-ion cells have slightly higher internal resistance before the first 8–10 cycles. The ECO 1's transducer firing load draws peak current that can push a cold, uncycled cell below the BMS cutoff threshold momentarily, triggering a protective shutdown. This is not a defective battery — it is the BMS protecting the cell before it has broken in. Run two to three full charge-discharge cycles away from patient use, and the shutdowns will stop as internal resistance drops to its rated value.