Schenker XMG P505-6OH Replacement Battery 14.8V 4000mAh

Schenker XMG P505 / P706 Series — 14.8V Li-ion Replacement Battery

This 14.8V, 4000mAh (59.2Wh) Li-ion battery replaces the original cell in the Schenker XMG P505-6OH, XMG P505-8AK, XMG P706, XMG P705, and related models. It restores unplugged capacity after the original cell has degraded through charge cycles. Voltage, connector pinout, and physical dimensions match the factory battery spec.

• XMG P505 and P706 platform fit: These models share the same 14.8V four-cell battery architecture, connector layout, and BMS communication protocol. That common platform is why a single replacement cell covers the full range — the voltage rail and handshake requirements are identical across the group.
• Bench tested on actual hardware: We ran the cell through charge and discharge cycles under sustained CPU and GPU load. The BMS communicated correctly with the host, reported state-of-charge without error flags, and held voltage within spec at peak draw.
• BIOS learn cycle after installation: After fitting this cell, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after swapping cells.

Why the XMG P505 shuts down at 20–30% battery shown

This happens when the fuel gauge IC is still calibrated to the old degraded cell. The new cell has higher actual capacity, but the IC maps that to the old voltage curve. Under full CPU and discrete GPU load, the cell hits a voltage cliff the IC did not expect, and the system cuts power before the displayed percentage reaches zero. Running two full discharge-to-hibernate then full-recharge cycles recalibrates the IC to the new cell's real voltage curve and stops the premature shutdown.

Battery reporting 0% or "unknown" immediately after swap

The BIOS reads EEPROM data embedded in the battery to identify chemistry, rated capacity, and cycle count. When a new cell is installed, that EEPROM data is unfamiliar to the system and can trigger an "unknown" or 0% reading on first boot. This is not a fault with the replacement cell. Boot into the BIOS, confirm the battery is detected on the power or hardware info page, then allow a full charge cycle to complete — the system will reconcile the EEPROM data and display correctly within one to two cycles.