Huawei MatePad 11 HB26D8C8ECW Replacement Battery 7150mAh

Huawei MatePad 11 (DBY-W09) — 3.82V Li-Polymer Replacement Battery (HB26D8C8ECW)

This is a 3.82V, 7150mAh lithium-polymer battery for the Huawei MatePad 11 tablet, specifically the DBY-W09 variant. It replaces OEM part HB26D8C8ECW and targets tablets that no longer hold a charge or shut down unexpectedly under load. The cell dimensions — 137.00 x 126.70 x 2.50mm — match the original battery tray without modification.

• MatePad 11 DBY-W09 fitment: The DBY-W09 uses a specific connector orientation and BMS handshake tied to the HB26D8C8ECW cell. Substituting a generic cell without the correct communication profile causes the tablet to reject the battery or report false state-of-charge readings from the first boot.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a DBY-W09 unit. The BMS accepted the cell without error flags, voltage stayed stable at 3.82V nominal, and the charge IC did not trigger over-temperature cutoff during a full charge from depleted.
• Fuel gauge recalibration after swap: After installing this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100% before using the tablet. This single cycle resets the fuel gauge IC against the new cell's actual capacity curve and eliminates the inaccurate percentage display that appears after most battery swaps.

MatePad 11 shutting down at 15–25% remaining

This happens when the fuel gauge IC is still calibrated to the old, degraded cell. The MatePad 11 draws a combined load from the display, WiFi radio, and background processes — this spike causes the voltage to drop below the BMS cutoff threshold faster than the percentage indicator predicts. The result is a hard shutdown while the OS still shows charge remaining. One full discharge-to-shutoff followed by an uninterrupted charge to 100% re-anchors the gauge. After that cycle, check that the tablet reads at or near 3.82V nominal on the battery information screen.

Fast charging not available after battery replacement

The MatePad 11 uses a proprietary fast-charge protocol that requires the charge IC to complete one accepted full charge cycle before it re-enables higher current delivery. After a battery swap, the tablet defaults to standard 5V charging as a protection measure until the new cell is verified. Plug in using the original Huawei charger — not a third-party USB-C adapter — and allow the first charge to complete fully without interruption. Once that cycle finishes, fast charge negotiation resumes on subsequent sessions.