Motorola HC40 Moto C Replacement Battery 3.8V 2200mAh

Motorola Moto C — 3.8V Li-ion Replacement Battery (HC40)

The HC40 is a 3.8V, 2200mAh Li-ion cell that powers the Motorola Moto C and Moto C Dual SIM variants, including the XT1758 and TD-LTE IN models. It slots in place of the original factory cell when the existing battery no longer holds a usable charge across a full day. Voltage and connector geometry match the OEM spec directly.

• Moto C variant compatibility: The Moto C, Moto C Dual SIM, Moto C Dual SIM TD-LTE IN, and XT1758 all share the same battery bay dimensions and 3.8V power rail. The HC40 connector pinout and BMS handshake are consistent across these variants, so one cell fits all of them.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Moto C platform. The BMS accepted charge from both USB and wall adapter without triggering a fault state, and protection circuitry responded correctly to over-discharge and over-current conditions.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging for the first complete discharge-charge cycle. The Moto C's fuel gauge IC is calibrated to the old cell's discharge curve. One full cycle at standard charge current gives the coulomb counter enough data to reset its reference point accurately.

Sudden shutdown at 20–30% on the Moto C after a cell swap

The Moto C's processor, modem, and display draw current simultaneously during active use. A new cell with a different internal impedance profile than the original can hit a voltage cliff earlier than the OS expects — the fuel gauge IC still thinks the cell will sustain voltage down to the calibrated floor, but the actual cell voltage collapses under load. The phone interprets this as a hard low-voltage event and cuts power immediately. One full discharge-charge cycle recalibrates the fuel gauge against the new cell curve and moves the shutdown threshold to the correct point.

OS reporting wrong battery percentage after HC40 installation

The Android fuel gauge IC on the Moto C stores a learned discharge model for the previous cell. When a new HC40 goes in, the stored model no longer matches the actual cell chemistry, causing the percentage to jump or report incorrectly. This is a coulomb counter calibration issue, not a fault with the replacement cell. Drain the battery fully until the phone shuts off, then charge uninterrupted to 100% — one complete cycle resets the reference and stabilises percentage reporting.