Northern Venus Medical Device Replacement Battery 11.1V 4800mAh

Northern Venus / Taurus — 11.1V Li-ion Replacement Battery (NT-L13S2P-PA)

This is an 11.1V, 4800mAh Li-ion replacement battery for the Northern Venus and Taurus portable medical devices. It matches the OEM part number NT-L13S2P-PA and fits both platforms directly. Capacity is rated at 53.28Wh from the product specification.

• Venus and Taurus platform fit: Both devices run the same 11.1V three-cell Li-ion architecture and share the NT-L13S2P-PA connector and BMS handshake profile. One battery SKU covers both units without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on bench equipment, confirming BMS communication, cell balancing across all three cells, and correct charge termination at 12.6V. No anomalies were logged.
• Power-on self-test sequence: After installation, let the device complete its full startup self-test without interruption. The BMS runs a verification pass at power-on — cutting power mid-sequence registers a false battery fault that persists until the next clean reboot.

Device not completing boot sequence on new battery

The Venus and Taurus both run a BMS verification step during boot before handing control to the main firmware. A new cell that has partially self-discharged during storage may sit below the minimum voltage the device expects to see at that stage. The device interprets a low cell voltage as a fault and halts the boot rather than proceeding to the home screen. Charge the battery fully to 12.6V before the first installation, then power on without interrupting the startup sequence.

Charge indicator not reaching 100% on first charge

On a first charge cycle, the device's charge IC applies a conservative current limit to a new cell — this is normal behaviour, not a fault. The fuel gauge reports capacity based on a baseline it has not yet calibrated against this specific cell, so it may read 95–98% and stop climbing. Run one complete charge-discharge-charge cycle and the gauge recalibrates against actual cell capacity. After that cycle the indicator will reach 100% consistently.