Trumpf 120030-O OP Pillar Replacement Battery 3.7V 3350mAh

Trumpf OP Pillar Teco-Trusystem — 3.7V Li-ion Replacement Battery (120030-O)

This 3.7V 3350mAh (12.4Wh) Li-ion cell replaces the original battery in the Trumpf OP Pillar Teco-Trusystem mobile surgical lighting column. It fits the Teco-Trusystem platform used in operating rooms where the illumination unit is mounted on a freestanding pillar. OEM part numbers 120030-O, 1690089, and 2084184 all cross to this cell.

• Teco-Trusystem platform fit: The Trumpf OP Pillar platform uses a single-cell 3.7V Li-ion pack with a dedicated BMS that verifies cell chemistry at power-on. The connector pinout and cell dimensions (68.20 × 18.50 × 18.50mm) match the OEM housing directly, so no modification is needed at the cell bay.
• Bench tested on actual hardware: We ran this cell through charge and load cycles on the Teco-Trusystem platform and confirmed the BMS completed its handshake without fault flags. The protection circuit responded correctly to both charge cutoff and low-voltage cutoff thresholds.
• Power-on self-test — do not interrupt: After fitting this cell, let the Teco-Trusystem complete its full startup self-test without cycling the power switch. The BMS runs a chemistry verification sequence at boot. Cutting power mid-sequence registers a battery fault that persists until the next complete reboot cycle.

BMS learn cycle on the Teco-Trusystem after a cold cell swap

The Teco-Trusystem BMS stores a charge profile from the previous cell. When a new cell is installed, the controller applies its stored thresholds before it has characterised the replacement. This means the first charge cycle may terminate early or report a conservative state-of-charge. Running one complete charge-discharge cycle lets the BMS recalibrate its cut-off and reporting registers to the new cell's actual characteristics. Until that cycle completes, charge percentage readings on the unit's display should not be treated as accurate.

Low-battery alarm triggers immediately after a confirmed full charge

This happens when the BMS compares the new cell's resting voltage against an OEM threshold calibrated for a partially aged cell. A fresh Li-ion cell at 3.7V nominal can read slightly differently at rest than the controller expects, and the alarm fires before the learn cycle is complete. Run the unit through one full charge-discharge-recharge cycle without interruption. After that cycle, the BMS resets its lower alarm threshold and the warning clears at a resting voltage above 3.5V.