Coolpad 8198T Replacement Battery 3.7V 1500mAh CPLD-311

Coolpad 8198T / 7295C — 3.7V Li-ion Replacement Battery (CPLD-311)

This is a 3.7V, 1500mAh Li-ion replacement battery for the Coolpad 8198T and 7295C smartphones. It carries OEM part number CPLD-311 and matches the original cell's voltage rail, connector, and physical footprint at 68.65 × 54.92 × 4.12mm. Fit the new cell when the original no longer holds a charge or the phone shuts down unexpectedly under load.

• 8198T and 7295C compatibility: Both models share the CPLD-311 form factor, the same 3.7V nominal rail, and an identical board connector — so one cell serves both devices without modification.
• Bench tested on actual hardware: We cycled this cell through a full charge and load discharge on the 8198T. The BMS accepted charge handshake on the first cycle, held the 3.7V nominal rail under screen and modem load, and tripped the low-voltage cutoff cleanly at the expected floor without an erratic shutdown.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-to-charge cycle at standard current. The phone's fuel gauge IC is calibrated to the old cell's discharge curve — giving it one full cycle at low current lets the coulomb counter map the new cell before high-current charging begins.

Why the 8198T reports wrong battery percentage after a cell swap

The fuel gauge IC on the 8198T stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry and impedance. The OS reads voltage and translates it to a percentage using the old map — so the number on screen drifts from reality. One full discharge and recharge cycle at standard current rewrites the coulomb counter reference and restores accurate reporting.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display draws a high current spike and the cell's voltage drops briefly below the BMS protection threshold — even though the displayed percentage looks safe. The fuel gauge hasn't yet learned the new cell's voltage cliff, so it doesn't warn the OS in time. The fix is the same recalibration cycle: one full discharge to the automatic shutoff point, then a full charge to 100%. After that cycle, the BMS and fuel gauge align, and the shutoff floor shifts to the correct voltage — typically around 3.4–3.5V under load.