BenQ P50 Replacement Battery 3.7V 2600mAh Li-Polymer

BenQ P50 — 3.7V Li-Polymer Replacement Battery (23.20115.102)

This is a 3.7V, 2600mAh Li-Polymer battery for the BenQ P50 smartphone. It matches the OEM part number 23.20115.102 and fits the original battery compartment. Install it when the original cell no longer holds charge or causes unexpected shutdowns.

• BenQ P50 fit: The P50 uses a fixed voltage rail and a BMS handshake tied to this specific cell format. The 23.20115.102 connector and physical dimensions match what the charge IC expects, so the device recognises the new cell and begins charging without errors.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a P50 unit. The BMS accepted the cell on first connection, charge termination triggered correctly at 4.2V, and the protection circuit tripped as expected under over-current load.
• Fuel gauge recalibration on first use: On first installation, disable fast charging if your charger supports it, then run one full discharge down to automatic shutdown followed by a complete charge. This gives the fuel gauge IC one clean cycle to map the new cell's discharge curve before high-current charging begins.

Sudden shutdown at 20–30% on the BenQ P50

This is a voltage-cliff failure. When the P50's modem fires or the screen peaks in brightness, it pulls a surge of current that the cell cannot sustain at low state of charge. Voltage drops below the BMS cutoff threshold in milliseconds, and the phone shuts off even though the OS was still reporting charge remaining. A fresh cell with lower internal resistance handles the surge without the voltage sag that triggers the cutoff. If shutdowns persist after replacement, run a full calibration cycle — one complete discharge to zero, then charge uninterrupted to 100%.

BenQ P50 shows wrong battery percentage after cell swap

The fuel gauge IC stores a learned model of the old cell's discharge curve in memory. When a new cell goes in, that model is wrong — the IC maps the new cell's voltage to old capacity values, so the percentage reading drifts or jumps. This is not a fault with the replacement battery. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the coulomb counter and lets the IC build a new curve against the actual cell. After that cycle, percentage readings stabilise.