Coolpad 5910 Compatible Battery 3.7V 2100mAh CPLD-312

Coolpad 5910 / 5950 / 8750 — 3.7V Li-ion Replacement Battery (CPLD-312)

This is a 3.7V, 2100mAh (7.77Wh) Li-ion battery for the Coolpad 5910, 5950, 8750, and 7296, among other compatible models. It replaces OEM parts CPLD-312, CPLD-351, and CPLD-342. If your Coolpad shuts down unexpectedly, won't hold a charge, or won't power on at all, this cell restores normal operation.

• Multi-model fit across the Coolpad lineup: The 5910, 5950, 8750, and 7296 share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. The BMS handshake protocol is consistent across these models, so one cell covers the full group without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on compatible Coolpad hardware. The BMS accepted the full charge curve without triggering a cutoff fault, and voltage held steady across the discharge profile under both screen-on and modem-active loads.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard current. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging pushes current into an uncalibrated cell.

Why the Coolpad 5910 reports wrong battery percentage after a cell swap

The fuel gauge IC on Coolpad devices stores a learned discharge curve from the original cell. When you swap the cell, the IC still references that old curve to estimate state of charge. The result is percentage readings that don't match real capacity — often reading 30% and then cutting off immediately. One full discharge-charge cycle at standard current forces the coulomb counter to rebuild its reference map against the new cell. After that cycle, percentage reporting stabilises.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff, not a capacity problem. Under high-current loads — active LTE modem, screen at full brightness — the cell voltage drops sharply below the BMS cutoff threshold even while the fuel gauge still shows charge remaining. The phone interprets the voltage drop as a critical low and shuts down. Fully charge the battery, then run the device under moderate load for the first few cycles to condition the cell. If shutdowns continue past three full cycles, check that resting cell voltage reads 4.1–4.2V after a full charge.