Huawei P8 Lite Replacement Battery HB3742A0EZC+ 3.8V 2200mAh

Huawei P8 Lite — 3.8V Li-Polymer Replacement Battery (HB3742A0EZC+)

This 3.8V, 2200mAh Li-Polymer battery replaces the original HB3742A0EZC+ cell in the Huawei P8 Lite. It fits ALE-L04, ALE-CL00, ALE-UL00, and over 29 additional ALE-series variants. Dimensions are 97.95 × 41.46 × 3.68mm — matching the original footprint for a direct swap.

• ALE-series model coverage: All listed ALE variants share the same battery bay geometry, connector pinout, and BMS handshake protocol. One cell covers the full range without modification.
• Bench tested on actual hardware: We ran this cell on ALE-L04 hardware. The BMS initialised correctly on first power-up, charge IC accepted the cell without flagging an error, and voltage held within spec across a full discharge cycle under mixed screen and modem load.
• Fuel gauge recalibration after swap: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on a replacement P8 Lite cell

This is a voltage cliff issue, not a capacity defect. Under combined modem and display load, the cell voltage drops sharply — the phone's power IC interprets this as a critically low voltage and shuts down before the fuel gauge reaches 0%. It happens most often in the first few cycles on a new cell, when the coulomb counter is still calibrated to the old cell's discharge profile. Running one full discharge to below 5% and a complete charge to 100% at standard rate resets the counter. After that cycle, the reported percentage tracks correctly against actual cell voltage.

OS reporting wrong battery percentage after cell replacement

The P8 Lite uses a fuel gauge IC that stores learned discharge data from the previous cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry. The result is percentage jumps, early low-battery warnings, or readings that stall at a fixed number for extended periods. One full discharge-charge cycle at standard rate forces the IC to relearn the curve against the new cell. After that cycle, readings stabilise to within a few percent of actual charge state.