Nokia CX10 CN110 Replacement Battery 3.87V 4350mAh

Nokia CX10 / TA-1332 / TA-1341 / TA-1350 — 3.87V Li-Polymer Replacement Battery (CN110)

The CN110 is a 3.87V, 4350mAh (16.83Wh) lithium-polymer cell for the Nokia CX10 smartphone and its regional variants — TA-1332, TA-1341, and TA-1350. It replaces an original cell that has degraded through repeated charge cycles and can no longer sustain voltage under normal screen and modem loads. Dimensions are 78.60 × 64.60 × 4.60mm — confirm clearance before fitting if your unit has any aftermarket frame modifications.

• CX10 variant coverage: The TA-1332, TA-1341, and TA-1350 share the same internal battery bay geometry, connector pinout, and BMS handshake protocol as the base CX10. One cell covers all these regional SKUs without any wiring or adapter changes.
• Bench tested on actual hardware: We ran the CN110 through charge-discharge cycles on CX10-compatible test rigs. The BMS accepted the USB charge handshake cleanly, held the 4.35V charge termination point correctly, and did not trigger over-voltage protection during a standard trickle-to-CC-to-CV charge sequence.
• Fuel gauge recalibration on first use: On first installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC build an accurate discharge curve against the new cell before the coulomb counter locks in its reference points for percentage reporting.

Sudden shutdown at 20–30% on the CN110 replacement cell

This is a voltage cliff problem, not a capacity problem. The fuel gauge IC still references the discharge curve of the old degraded cell, so it predicts 20–30% remaining at a voltage point where the new cell is actually delivering full charge. When modem or display load spikes current draw, the reported percentage still shows 20–30% but the cell voltage drops sharply below the protection threshold — the BMS cuts power immediately. One full discharge-charge cycle without fast charging resets the coulomb counter and resolves the mismatch. After recalibration, charge level reporting should track accurately down to 5% before any low-voltage cutoff occurs.

USB-PD fast charge not activating on the first cycle after swap

After a cell replacement, the CX10's charge IC may default to standard 5V/1A input on the first charge cycle rather than negotiating the higher-power USB-PD profile. This happens because the BMS on a new cell starts with conservative limits until it completes one full charge cycle and confirms cell impedance is within expected range. Plug into a USB-PD charger, allow the first charge to complete fully at whatever rate the IC accepts, then unplug and replug — the charger negotiation on the second cycle should step up to the fast-charge voltage tier. If it does not, check that the charger itself outputs at least 9V/2A to satisfy the CX10's PD contract requirement.