Huawei P Smart 2021 Replacement Battery HB526488EEW 4850mAh

Huawei P Smart 2021 / Enjoy 20 SE — 3.85V Li-Polymer Replacement Battery (HB526488EEW)

This is a 3.85V, 4850mAh (18.67Wh) Li-Polymer cell built to replace the original HB526488EEW battery in the Huawei P Smart 2021. It fits the PPA-LX2 and PPA-L22 variants as well as the Enjoy 20 SE. The cell matches the original 87.10 × 63.10 × 5.00mm footprint and connector orientation.

• P Smart 2021 / Enjoy 20 SE platform: Both devices share the Kirin 710A platform and the same battery bay geometry, connector pitch, and BMS handshake protocol — that is why one part number covers the full range of PPA-LX2, PPA-L22, and Enjoy 20 SE variants.
• Bench tested on actual hardware: We ran the cell on a PPA-LX2 unit. The BMS accepted the cell without fault codes, charge IC negotiated correctly to the expected constant-current phase, and the fuel gauge IC logged the first cycle without error flags.
• First-cycle fuel gauge reset: After installation, disable fast charging and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the coulomb counter a clean reference cycle against the new cell's actual discharge curve before fast-charge current is introduced.

Sudden shutdown at 20–30% on the P Smart 2021 after a cell swap

The P Smart 2021's fuel gauge IC stores a discharge curve calibrated to the old, degraded cell. When a fresh cell is installed, the IC underestimates remaining voltage and triggers shutdown early because the curve no longer matches actual cell behaviour. The phone's modem and display create brief high-current draw spikes that pull cell voltage below the IC's cutoff threshold before the real state of charge is exhausted. Running two complete discharge-charge cycles without fast charging corrects the stored curve. After recalibration, the reported percentage tracks the actual cell voltage accurately down to the 3.4V low-voltage threshold.

USB-PD fast charge not negotiating on the first cycle after replacement

On the first charge cycle after installation, the BMS on a fresh cell may present an impedance profile that the charge IC reads as out of range, causing it to fall back to standard 5V charging rather than negotiating the higher-voltage fast-charge contract. This is not a fault — it resolves once the BMS has completed one full cycle and updated its internal resistance estimate. Let the first charge run at standard rate to 100% without interruption. After that cycle, reconnect the original charger and the fast-charge handshake should negotiate as normal.