Medion Erazer X17801 Compatible Battery 15.2V 3550mAh P970BAT-4

Medion Erazer X17801 — 15.2V Li-Polymer Replacement Battery (P970BAT-4)

This is a 15.2V, 3550mAh (53.96Wh) Li-Polymer replacement battery for the Medion Erazer X17801 gaming laptop, including the MD 61569 MSN 30027053 variant. It uses OEM part number P970BAT-4 and fits the original battery bay without modification. Voltage and connector match the factory spec exactly.

• Erazer X17801 platform fit: Both X17801 variants share the same P970BAT-4 battery specification — same 15.2V cell configuration, same connector pinout, and the same BMS handshake protocol used by the Erazer platform's embedded controller. One replacement covers both.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Erazer platform. The BMS negotiated correctly, cell balancing completed without fault codes, and charge termination triggered at the expected voltage ceiling with no thermal events.
• First-cycle calibration on the Erazer X17801: After installing, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health or unknown-battery warning that reliably appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after fitting the P970BAT-4

The Erazer X17801 BIOS reads health data from EEPROM registers that were written by the original cell over months of use. A new cell arrives with factory EEPROM values that don't match the history the BIOS expects, so it flags the battery as degraded or unknown — even when the cell is in full working condition. This is not a fault with the replacement. Run the full learn cycle described above: discharge to hibernate, charge to 100% uninterrupted. After one to two completed cycles, the BIOS recalibrates against the new cell's actual data and the health warning clears.

Laptop shuts down hard at 20–30% charge shown on the fuel gauge

This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. Under sustained CPU and display load, the Erazer draws significant current and the new cell's actual voltage drops faster than the uncalibrated gauge predicts — the laptop hits the low-voltage cutoff while the display still shows 20–30% remaining. The fix is calibration, not a faulty battery. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100%. After those cycles, the fuel gauge IC re-maps against the new cell's discharge curve and the shutdowns stop. If the issue persists after three cycles, check BIOS battery settings and confirm charge mode is not capped below 15.2V nominal.