About this replacement
Huawei Honor X1 7D-504L — 3.7V Li-Polymer Replacement Battery (HB4269B6EAW)
This is a 3.7V, 4100mAh (15.17Wh) lithium-polymer replacement battery for the Huawei Honor X1 tablet. It fits the Honor X1 7D-504L and Honor X1 4G 7D-504L. Swap it in when the original cell can no longer hold a usable charge or fails to power the device at all.
- Honor X1 7D-504L and 4G variant: Both models share the same battery bay dimensions and connector pinout. The HB4269B6EAW fits both without modification — same 126 x 70 x 4mm cell footprint and identical BMS handshake protocol.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Honor X1 platform. The BMS accepted the cell without fault codes, and the charge IC reached CV phase correctly at the expected voltage threshold.
- Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter.
Why the Honor X1 reports wrong battery percentage after a cell swap
The Honor X1 uses a fuel gauge IC that builds its capacity model from historical charge and discharge data tied to the original cell. When a new cell goes in, the IC still references the old curve. Percentage readings will drift — often showing full charge early or dropping faster than expected. One full, uninterrupted discharge-to-shutdown followed by a complete charge cycle forces the IC to rebuild its model against the new cell. After that cycle, readings stabilise.
Sudden shutdown at 20–30% on the replacement cell
This happens when the fuel gauge IC has not yet recalibrated and misreads the cell's remaining voltage headroom. Under load — particularly when the display backlights fully or the modem transmits — the cell voltage drops sharply, crossing the BMS undervoltage cutoff while the OS still shows 20–30%. It is not a faulty cell. Run one complete discharge cycle without interruption, letting the device shut down naturally at 0%, then charge uninterrupted to 100%. After that cycle the gauge IC recalibrates and cutoffs align with the displayed percentage.