BQ Aquaris X5 Plus Compatible Battery 3.85V 3100mAh

BQ Aquaris X5 Plus — 3.85V Li-Polymer Replacement Battery (3200)

This is a 3.85V, 3100mAh lithium-polymer cell for the BQ Aquaris X5 Plus smartphone. It replaces part number 3200 when the original cell degrades or fails to hold a charge. Dimensions are 74.80 × 60.40 × 3.90 mm — verify fitment against your existing cell before installation.

• Aquaris X5 Plus fitment: This cell matches the voltage rail, connector pinout, and physical envelope of the X5 Plus battery bay. The BMS communicates with the phone's charge IC over the same SMBus protocol as the original BQ part number 3200.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on an X5 Plus unit. The BMS accepted charge handshake on the first cycle, and the charge IC stepped through CC and CV phases without error flags.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. The fuel gauge IC needs to map its coulomb counter against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the replacement cell

A new cell has a steeper voltage curve than a worn original. When the modem transmits or the screen peaks in brightness, current draw spikes and the cell voltage drops sharply — the BMS reads that as a low-voltage fault and cuts output. The phone shuts off even though the fuel gauge still showed charge remaining. One full discharge-charge cycle lets the coulomb counter remap the curve, and the shutdowns typically stop after that calibration pass.

OS reporting wrong battery percentage after the cell swap

The Aquaris X5 Plus fuel gauge IC stores a learned discharge curve from the old cell in its non-volatile memory. After fitting a new 3100mAh cell, that stored curve no longer matches, so percentage readings jump or read high. Drain the phone fully until it powers off, then charge uninterrupted to 100% with fast charge disabled. After that single full cycle the fuel gauge resets its reference points against the new cell.