About this replacement
Bard Medsystems Portascan / Urodyn+ — 12V Ni-MH Replacement Battery (PA-00149-00127)
This is a 12V 4500mAh Ni-MH replacement battery for the Bard Medsystems Portascan, Urodyn+, and Bardscan portable ultrasound scanners. It matches the OEM voltage rail and cell chemistry used in the original pack. Capacity is rated at 54Wh, identical to the factory specification.
- Portascan / Urodyn+ / Bardscan platform: All three models share the same 12V Ni-MH battery bay, connector pin-out, and BMS handshake protocol. A single cell pack covers the full platform without modification.
- Bench tested on actual hardware: We cycled this pack through full charge and controlled discharge on a 12V Ni-MH bench fixture. The BMS accepted the cell without triggering a chemistry mismatch fault, and charge termination via delta-V cutoff fired correctly at full capacity.
- Power-on self-test protocol: After installing this pack, let the device complete its full startup self-test sequence without interruption. The Portascan runs a BMS verification routine at boot — cutting power mid-sequence registers a false battery fault that persists until the next complete reboot cycle.
Why the Portascan flags a battery fault after a new pack is installed
The Portascan's BMS stores charge history from the previous cell pack. When a new pack is inserted, the controller has no learned capacity baseline for it. Until one full charge-discharge cycle is completed, the BMS applies conservative thresholds that can trigger low-battery or fault warnings even when the cell is fully charged. This is a BMS learn cycle issue, not a cell defect. Run one complete charge-to-full, then a full discharge under normal clinical load, before relying on the battery indicator for clinical decisions.
Charge indicator stalling below 100% on first charge
On the first charge, the Portascan's charge IC applies a conservative current limit to an uncharacterised cell. Delta-V detection — the voltage dip signal that tells the charger the cell is full — is weaker on a new Ni-MH pack than on a conditioned one. The charger may terminate early or display a sub-100% reading as a result. Let the device complete a second full charge cycle; delta-V response normalises as the cell conditions, and the indicator will reach 100% consistently from the third cycle onward.