Huawei MediaPad 10FHD Replacement Battery HB3S1 3.7V 6400mAh

Huawei MediaPad 10FHD Series — 3.7V Li-Polymer Replacement Battery (HB3S1)

This is a 3.7V, 6400mAh Li-Polymer battery for the Huawei MediaPad 10FHD, MediaPad S10, S101U, and S101L tablets. Part number HB3S1. It fits the slim 10-inch tablet chassis and connects to the original BMS board without modification.

• MediaPad S10 series fit: The S10, S101U, S101L, and 10FHD all share the HB3S1 form factor — same connector pinout, same voltage rail at 3.7V nominal, and the same BMS handshake protocol. One cell covers the full range.
• Bench tested on actual hardware: We cycled this cell through charge and full-draw discharge on a MediaPad 10FHD. The BMS accepted the cell without fault flags, held charge termination correctly at 4.2V, and showed no thermal anomalies during the high-current draw phase.
• Post-swap calibration for the MediaPad fuel gauge: After fitting this cell, run one full discharge to automatic shutdown, then charge uninterrupted to 100%. This forces the tablet's fuel gauge IC to re-map against the new cell's actual capacity curve and clears the inaccurate percentage readings that appear in the first few cycles.

Why the MediaPad 10FHD reports poor battery health immediately after a cell swap

The MediaPad stores battery health data in EEPROM on the BMS. When you fit a new cell, the EEPROM still holds the degradation profile from the old one. The OS reads that stored data first — not the actual cell voltage — so it flags the battery as poor or unknown before any real measurement has occurred. Running two full charge-discharge calibration cycles overwrites the stale EEPROM values and brings the health indicator back to normal. No firmware update or factory reset is needed.

Tablet showing 23% then cutting to black mid-use after battery replacement

This is a voltage cliff problem, not a defective cell. Under combined Wi-Fi, display, and processor load, the cell voltage drops faster than the fuel gauge can recalculate. The tablet's low-voltage protection triggers a hard cutoff before the displayed percentage reaches zero. The fix is a full calibration cycle: discharge the tablet to automatic hibernate shutdown, then charge to 100% without interruption. After two cycles, the fuel gauge IC has enough data to accurately track voltage sag under load and the premature shutdowns stop. Target charge termination voltage is 4.2V.