About this replacement
Huawei MediaPad M1 8.0 — 3.8V Li-Polymer Replacement Battery (HB3080G1EBW)
This 3.8V, 4650mAh Li-Polymer battery replaces the OEM cell in the Huawei MediaPad M1 8.0 tablet. It fits the S8-301L, S8-701w, and S8-701u model variants, along with additional MediaPad M1 configurations sharing the same connector and voltage rail. Capacity figure is taken directly from product data — 17.67Wh.
- MediaPad M1 8.0 series fit: The S8-301L, S8-701w, and S8-701u share the same 3.8V battery bay, connector pinout, and BMS handshake protocol. A single cell covers all three variants without modification.
- Bench tested on actual hardware: We cycled this battery through charge and discharge on the MediaPad M1 platform. The BMS accepted the cell without fault flags, and the charge IC communicated normally at both standard and fast-charge thresholds.
- Fuel gauge recalibration after swap: After installation, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. The fuel gauge IC calibrates against the new cell during this cycle. Skipping it causes inaccurate percentage readings from the first power-on.
MediaPad M1 shutting down at 15–25% remaining after a battery swap
This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. Combined display and Wi-Fi load creates a voltage draw spike that pulls the cell below the BMS cutoff threshold before the reported percentage reaches zero. The tablet interprets this as an empty battery and shuts down even though the gauge reads 15–25%. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% resets the gauge against the new cell's actual voltage floor.
Fast charging unavailable on the MediaPad M1 after a battery replacement
Huawei's fast-charge protocol requires the charge IC to complete one accepted full cycle before it re-enables higher current delivery to a new cell. If fast charging doesn't appear after the first use, that cycle hasn't completed yet. Plug in using the original Huawei charger and cable, let the tablet reach 100% without interruption, then unplug. Fast-charge negotiation should resume from the next charge session.