Terumo TE-171 Replacement Battery 9.6V 3000mAh 8N-1200SCK

Terumo TE-171 / TE-172 Infusion Pump — 9.6V Ni-MH Replacement Battery (8N-1200SCK)

This is a 9.6V Ni-MH replacement battery rated at 3000mAh (28.8Wh) for the Terumo TE-171 and TE-172 infusion pumps. It replaces OEM part number 8N-1200SCK and fits the connector and bay dimensions of both pump variants. Use the product data capacity figures — 3000mAh and 28.8Wh — for any documentation or clinical records.

• TE-171 and TE-172 compatibility: Both pump models share the same 9.6V battery rail, physical bay dimensions (89.52 × 45.04 × 44.82 mm), and OEM part number 8N-1200SCK. The BMS connector pinout is identical across both units, so no adapters or modifications are needed.
• Bench tested on actual hardware: We cycled this cell under the TE-171's load profile, including the pump motor start draw. The BMS cleared charge verification on the first full cycle and held voltage within operating spec through sustained delivery sequences.
• Post-installation self-test protocol: After fitting this battery, allow the pump to complete its full power-on self-test without interruption. Terumo infusion pumps run a BMS verification routine at startup — cutting power during this sequence writes a false battery fault that persists through subsequent reboots until a clean full-cycle reset clears it.

Charge indicator not reaching 100% on the first charge cycle

Terumo's charge IC applies a conservative current ceiling when it detects a new or deeply discharged Ni-MH cell. On the first charge, the indicator may stall between 85–95% before the pump flags a completed charge. This is the charge controller protecting the cell during initial conditioning, not a fault. Run one full charge-discharge cycle before treating the indicator reading as calibrated. After that cycle, the charge IC recalibrates its delta-V cutoff to the actual cell capacity.

TE-171 triggering a low-battery alarm immediately after a confirmed full charge

This happens when the BMS compares the new cell's resting voltage against a threshold calibrated for a partially degraded OEM cell chemistry. A fresh Ni-MH cell at full charge can sit marginally outside the expected voltage window on the first cycle, which the pump interprets as a low-battery condition. The fix is to complete one full charge-discharge cycle so the BMS can register the actual capacity baseline of the new cell. After that cycle, the alarm clears and the pump reads the battery correctly — confirm with a resting voltage of 10.2–10.8V before returning the unit to clinical use.