Coolpad 3602U CPLD-348 Replacement Battery 3.7V 2000mAh

Coolpad 3602U — 3.7V Li-Polymer Replacement Battery (CPLD-348)

This is a 3.7V, 2000mAh Li-Polymer cell replacing the original CPLD-348 battery in the Coolpad 3602U smartphone. It fits the 3602U only — confirm your model number before ordering. Capacity is 2000mAh (7.4Wh), matching the stock specification.

• Coolpad 3602U fitment: The 3602U uses a fixed connector pinout and BMS handshake tied to the CPLD-348 form factor. This cell matches that connector, voltage rail, and physical dimensions (68.56 × 50.00 × 4.65mm) so the charge IC accepts it without fault codes.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the 3602U platform. The BMS accepted the cell on first connection, the charge IC stepped through its CC/CV stages cleanly, and the fuel gauge IC began tracking within the first full cycle.
• First-cycle calibration tip: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the Coolpad 3602U

This is a voltage cliff issue, not a capacity problem. When the modem searches for signal or the screen peaks brightness, current draw spikes sharply. If the fuel gauge IC is still calibrated to the old degraded cell's discharge curve, it misreads the new cell's state of charge and the BMS trips before the real charge is exhausted. One full uninterrupted discharge-charge cycle — without fast charging — resets the coulomb counter and eliminates most false shutdowns. If shutdowns persist after two full cycles, check that the battery connector is fully seated and making clean contact at all four pins.

Phone reports wrong percentage after replacing the CPLD-348

The fuel gauge IC on the 3602U stores a learned discharge curve from the old cell. Swapping in a new cell doesn't automatically reset that learned model, so the reported percentage drifts — often reading 100% too quickly or dropping erratically under load. Run one complete cycle: drain the phone until it powers off automatically, then charge uninterrupted to 100% without using the device. After that single cycle the coulomb counter recalibrates against the new cell and percentage readings stabilise. If the gauge still drifts after two cycles, wipe the battery stats cache through the device's recovery menu.