Coolpad 5860 Replacement Battery CPLD-74 3.7V 2800mAh

Coolpad 5860 / 5860e — 3.7V Li-ion Replacement Battery (CPLD-74)

This is a 3.7V, 2800mAh Li-ion replacement battery for the Coolpad 5860 and 5860e smartphones. It matches the OEM part number CPLD-74 and physically fits the battery bay with the correct connector orientation. Capacity figures come from the product data — 10.36Wh total energy.

• 5860 and 5860e compatibility: Both models share the same battery bay dimensions (65.30 × 49.95 × 10.00mm), the same 3.7V nominal voltage rail, and the same CPLD-74 connector pinout. One replacement covers both variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the 5860 platform. The BMS communicated correctly with the charge IC, accepted a full charge without interruption, and held voltage under screen-on and modem load without early cutoff.
• First-cycle fuel gauge reset: On first use after installation, disable fast charging and run one complete discharge down to auto-shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC a clean reference discharge curve for the new cell before high-current charging begins.

Sudden shutdown at 20–30% on the Coolpad 5860 after a cell swap

This is a voltage cliff issue, not a capacity defect. The fuel gauge IC still holds the discharge curve mapped to the old, degraded cell. When the new cell hits a load spike from the modem or display, the IC reads the voltage drop as a near-empty event and triggers shutdown — even though charge remains. One full discharge-to-shutdown cycle followed by an uninterrupted charge to 100% forces the coulomb counter to re-map the curve. After that cycle, early shutdowns at 20–30% stop.

Battery percentage jumping erratically after replacement

Erratic percentage readings — jumping from 60% to 40% or stalling at a fixed number — mean the fuel gauge IC is still calibrating against the new cell's impedance profile. The IC uses stored data from the previous cell, and the mismatch causes inconsistent coulomb counting. Run the phone down to auto-shutdown without topping up partway, then charge straight to 100% with the screen off. One clean cycle is usually enough to stabilise the readout.