About this replacement
Samsung R50-V01 / M55 / R55 Series — 11.1V Li-ion Replacement Battery (AA-PB0NC6B)
This is an 11.1V, 4400mAh (48.84Wh) Li-ion battery for the Samsung R50-V01 and related R/M-series notebooks. It fits the OEM connector and BMS handshake on the R50-V01, M55 XEP 2500, R55-T5200 Piper, R50-CV05, and over 100 additional Samsung notebook variants sharing the AA-PB0NC6B platform. Drop the OEM part number into your system specs tab before ordering to confirm the match.
- R/M-series platform compatibility: These models share a common 11.1V three-cell Li-ion architecture with the same connector pinout and BMS communication protocol. Samsung kept this battery standard across a wide production run, so one cell replaces a broad range of SKUs without firmware or connector changes.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on R-series hardware and confirmed the BMS handshake initialised correctly, charge termination triggered at full capacity, and the protection circuit tripped cleanly on simulated over-discharge.
- First-cycle calibration on Samsung notebooks: After installing, run the laptop down to hibernate cutoff on battery alone — no AC during the discharge. Then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to re-baseline against the new cell and clears the inaccurate health warning that typically appears after every cell swap.
Why Samsung R-series BIOS flags replacement cells as poor health
Samsung's BIOS reads EEPROM data written by the original factory cell. When a new cell is installed, that EEPROM profile no longer matches the live chemistry data the BMS is reporting, so the BIOS health meter reads low or unknown. This is a calibration state, not a fault. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% lets the BIOS rewrite its learned capacity baseline against the new cell. After two or three of these cycles the health indicator normalises.
Laptop shuts down at 20–30% shown on the gauge
This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. Under full CPU and display load, the new cell's voltage curve doesn't match the outdated lookup table, so the gauge reads 20–30% while the real state of charge is far lower — and the system shuts down to protect the cell. The fix is a full recalibration: discharge fully to hibernate cutoff, then charge uninterrupted to 100%, and repeat once more. After two complete cycles the fuel gauge IC recalculates against the new cell's actual voltage curve and the shutdowns stop.