Nokia 3.2 WT240 Replacement Battery 3.85V 3950mAh

Nokia 3.2 / TA-1154 — 3.85V Li-Polymer Replacement Battery (WT240)

This is a 3950mAh Li-Polymer replacement battery for the Nokia 3.2 smartphone, covering variants TA-1154, TA-1156, and TA-1159. It matches the original WT240 specification at 3.85V nominal voltage. Swap it in when the original cell no longer holds a usable charge through a full day.

• Nokia 3.2 variant coverage: The TA-1154, TA-1156, and TA-1159 share the same physical cell footprint, connector pinout, and BMS communication protocol — one battery fits all three without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a Nokia 3.2 unit. The BMS accepted the handshake without fault codes, and the charge IC stepped through trickle, CC, and CV phases as expected on first cycle.
• Fuel gauge recalibration on first use: After installation, disable fast charging and complete one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC one clean reference cycle against the new cell's discharge curve before high-current charging begins.

Why the Nokia 3.2 reports wrong battery percentage after a cell swap

The Nokia 3.2 uses a coulomb-counter-based fuel gauge IC that builds its charge model against the original cell's impedance and discharge curve. When you install a new cell, the IC still references the old curve, so reported percentage drifts from actual state-of-charge. The gauge recalibrates itself over one to three complete discharge-charge cycles. After the first full cycle from 100% down to auto-shutdown and back to 100%, percentage reporting tightens noticeably.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC has not yet mapped the new cell's voltage-to-capacity curve. Under load — screen at full brightness, mobile data active, or a call in progress — the cell voltage drops sharply at the low end of charge, hitting the BMS undervoltage cutoff before the OS registers a low-battery warning. It is not a faulty cell. Complete two full discharge-charge cycles and the gauge learns where the voltage cliff sits. If shutdowns persist past three cycles, check that the cell connector is fully seated — a partial connection raises contact resistance and amplifies voltage sag under load.