Huawei MateBook 13S Replacement Battery 11.55V 5100mAh

Huawei MateBook 13S / 14S Series — 11.55V Li-Polymer Replacement Battery (HB5781P1EEW-31A)

This 11.55V, 5100mAh (58.91Wh) Li-Polymer cell replaces the original battery in the Huawei MateBook 13S I5 11300H and the MateBook 14S I7 series. It matches the OEM voltage rail, physical dimensions, and connector spec so the board recognises the new cell on first boot. Compatible part numbers include HB5781P1EEW-31A, HB5781P1EEW-31C, HB5881P1EEW-31C, and HB5881P1EEW-31A.

• MateBook 13S and 14S platform fit: Both the 13S and 14S share a common battery connector pinout and BMS handshake protocol across the I5 11300H, I7-11370, and I7-12700 variants. The same voltage rail and EEPROM communication spec runs across the range, which is why one cell covers all listed models without adapter wiring.
• Bench tested on actual hardware: We ran this cell on a MateBook 14S board and monitored the BMS handshake through full charge and load cycles. The protection circuit responded correctly to charge cutoff at 100% and activated undervoltage cutoff without a forced shutdown event at the low end.
• First-cycle calibration after install: After fitting this cell, run the laptop down to hibernate cutoff under normal workload — do not force shutdown — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle. Skipping it leaves the fuel gauge IC calibrated to the old cell's wear curve, which causes the OS to report inaccurate charge percentages for weeks.

BIOS reporting poor battery health immediately after fitting a new cell

When you swap the physical cell, the BIOS still holds EEPROM data written by the previous battery's management IC. That stored data includes cycle count, designed capacity, and health state — none of which reflects the new cell. The system compares live voltage readings against those stale figures and flags a mismatch as degraded health. Running one full discharge-to-hibernate then a clean charge to 100% rewrites the learn cycle and clears the warning. If the health flag persists after two full calibration cycles, check that the firmware is on the latest Huawei BIOS version, as earlier builds had a known issue with third-party cell EEPROM recognition.

MateBook shutting down at 20–30% charge shown on screen

This happens when the cell voltage drops below the BMS cutoff threshold under combined CPU and display load, even though the fuel gauge still reads 20–30%. The fuel gauge IC is tracking a capacity model from the old cell — it underestimates how fast voltage drops on the fresh cell under high draw. The fix is the same calibration cycle: full discharge to automatic hibernate, then uninterrupted charge to 100%. After two cycles the fuel gauge IC recalculates the discharge curve against the new cell's actual chemistry and the premature shutdown stops. If it continues after three calibration cycles, check your BIOS battery charge limit setting — some MateBook firmware defaults to an 80% charge ceiling that compounds the inaccurate low-end reading.