SSCOR 3303 9.6V Replacement Battery 2000mAh Ni-MH

SSCOR 3303 / AD-3000 Series — 9.6V Ni-MH Replacement Battery (5903)

This is a 9.6V, 2000mAh Ni-MH battery replacing OEM part numbers 5903, 9714, and B11094, among others. It fits the SSCOR 3303 portable suction unit and the AD-3000 series, including the AD-3000 Pulse Oximeter. These devices are used for airway clearance in emergency and clinical environments where interruption is not an option.

• 3303 and AD-3000 platform fit: These models share the same 9.6V battery rail, connector configuration, and BMS handshake protocol, which is why a single cell pack covers the range. The BMS on each device reads cell voltage and chemistry type at startup — Ni-MH chemistry is correctly identified across all listed models.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a SSCOR-series test rig. The BMS accepted the cell without a fault flag, completed its voltage verification pass, and held load under the suction motor draw without triggering a low-cell cutoff.
• Power-on self-test after installation: After fitting this battery, let the device complete its full startup self-test without cycling power mid-sequence. SSCOR units run a BMS verification routine at boot — cutting power during this sequence registers a false battery fault that sticks until the next clean reboot.

Why the SSCOR 3303 flags a battery fault in the first few cycles

The 3303's charge management circuit applies a conservative acceptance threshold when it first sees a new Ni-MH pack. On cycles one through ten, the BMS is still mapping cell capacity and internal resistance — it hasn't built a full charge profile yet. During this window, the device may flag a battery warning even when the cell is charged and healthy. Run one complete charge-discharge cycle before clinical use to let the BMS complete its learn routine and clear the threshold flag.

Charge indicator not reaching 100% on first charge

This happens because the charge IC applies a reduced acceptance limit on an uncharacterised cell — it terminates early rather than risk overpressure on a pack with unknown internal resistance. The cell is not defective; the IC is applying a deliberate safety ceiling. Run the first charge on the device's standard overnight cycle without interruption. After one full charge-discharge pass, the IC recalibrates its termination point and the indicator reaches full charge normally.