About this replacement
Coolpad BTR3636AB / Canvas / Splatter — 3.8V Li-Polymer Replacement Battery (CPLD-415)
This is a 3.8V, 2300mAh Li-Polymer cell replacing part number CPLD-415. It fits the Coolpad BTR3636AB, Canvas, and Splatter smartphones. Voltage and physical dimensions — 82.00 × 63.80 × 4.00mm — match the original cell exactly.
- BTR3636AB, Canvas, and Splatter compatibility: All three models share the same battery bay dimensions, connector pinout, and 3.8V voltage rail, which is why a single cell covers the group. The BMS handshake and thermistor line are wired identically across this platform.
- Bench tested on actual hardware: We ran the cell through a full charge-discharge cycle and confirmed the BMS accepts the charge IC handshake without throwing a fault. Voltage held steady above 3.5V through the bulk of the discharge curve.
- Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. The fuel gauge IC on this platform calibrates its coulomb counter against the cell's discharge curve on that first cycle — skipping this step with fast charge active pushes current into an uncalibrated cell and delays accurate percentage reporting.
Sudden shutdown at 20–30% on the CPLD-415 replacement cell
This is a voltage cliff issue, not a capacity fault. Under modem transmit or screen-on load, the cell voltage drops sharply below the fuel gauge's cutoff threshold before the displayed percentage reaches zero. The phone cuts power to protect the cell even though the gauge still shows charge remaining. One full slow-charge cycle lets the coulomb counter reset its endpoint and pushes that cliff lower in the discharge curve.
Phone not powering on after the replacement cell sat in storage
Li-Polymer cells self-discharge in storage, and if this one dropped below 2.5V per cell before installation, the BMS enters lockout mode and blocks all load current. Plugging in a standard USB charger won't break the lockout — the BMS needs a trickle current below 100mA to recover. Use a charger that supports trickle or pre-charge mode, leave it connected for 15–20 minutes, and the BMS should release once the cell climbs back above 2.8V.