About this replacement
KCI Info VAC Therapy Unit — 12V Ni-MH Replacement Battery (340426)
This is a 12V, 2100mAh Ni-MH replacement battery for the KCI Info VAC and VAC Freedom Therapy Units. It fits devices running OEM part numbers 340426, 60050, B11734, M3252795-A, OM0117, and OM11734. The battery powers the portable negative pressure wound therapy unit, maintaining suction output during patient mobility.
- Info VAC and VAC Freedom platform fit: Both units share the same 12V battery rail, connector pinout, and BMS handshake protocol. A single cell format covers both devices without modification or adapter.
- Bench tested on actual hardware: We cycled this battery through the Info VAC's charge IC and confirmed the BMS completed cell recognition without fault codes. Charge termination triggered correctly at full capacity on the second cycle.
- Post-swap self-test protocol: After fitting this battery, allow the device to complete its full power-on self-test without interruption. The Info VAC runs a BMS verification sequence at startup — cutting power during this window registers a battery fault that persists until the next clean reboot.
Why the Info VAC alarms low battery immediately after a confirmed full charge
The Info VAC's charge controller compares cell voltage against an OEM-calibrated threshold during self-test. A new Ni-MH cell sits slightly below peak resting voltage until it completes one full charge-discharge cycle. The BMS interprets this as a marginal cell and triggers the low-battery alarm even when the pack is fully charged. Run one complete cycle — full charge, allow the device to draw the battery down through normal use, then recharge fully — before trusting the indicator in a clinical setting.
Charge indicator stalls below 100% on first charge
The Info VAC's charge IC applies a conservative current limit when it encounters a new or previously discharged Ni-MH cell. This causes the charge indicator to plateau and appear stuck, typically between 85–95%. The cell is still accepting charge — the IC is simply rate-limiting until internal resistance normalises. Let the charge cycle complete uninterrupted; resting voltage on a full Ni-MH cell at 12V nominal should read approximately 13.2–13.8V across the pack terminals before use.