About this replacement
Coolpad D530 / E239 / W711 — 3.7V Li-ion Replacement Battery (CPLD-47 / CPLD-50)
This is a 3.7V, 1150mAh Li-ion cell that replaces the original battery in the Coolpad D530, E239, W711, and 8811 smartphones. It fits the same connector and sits within the same 64.30 × 43.40 × 4.35mm envelope as the factory cell. Swap it in when the original no longer holds a charge or the phone shuts down unexpectedly under load.
- D530 / E239 / W711 / 8811 platform fit: These four models share the same battery bay geometry, connector pinout, and BMS handshake protocol — which is why a single cell covers all of them. The charge IC on each device expects the same 3.7V nominal rail and protection thresholds from the CPLD-47 and CPLD-50 part numbers.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a D530 unit. The BMS accepted the cell without fault codes, protection cutoff triggered correctly at low voltage, and the charge IC reached full termination current as expected.
- Fuel gauge recalibration tip: On first use after installation, run one complete discharge to automatic cutoff, then charge uninterrupted to 100%. This gives the fuel gauge IC a full discharge curve to work from on the new cell before the OS starts reporting percentage.
Why the D530 reports the wrong battery percentage after a cell swap
The D530 uses a coulomb counter that was trained on the discharge curve of the original cell. When a new cell goes in, the stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The phone reads voltage, maps it to an old curve, and outputs a percentage that can be off by 10–20%. One full discharge-to-cutoff followed by an uninterrupted charge to 100% resets the counter's reference points and brings the reported percentage back in line.
Sudden shutdown at 20–30% on the replacement cell
This happens when the modem or screen pulls a current spike that drops cell voltage below the BMS protection threshold — even though the fuel gauge still shows charge remaining. A 1150mAh cell running an uncalibrated fuel gauge is especially vulnerable in the first few cycles because the IC does not yet know where the real voltage cliff sits. Let the phone shut off on its own once, charge it fully, and repeat. After two or three full cycles the fuel gauge locates the cliff accurately and the shutdowns stop. If they continue past three cycles, measure resting cell voltage with a multimeter — it should read above 3.6V at the "30% remaining" point.