OPPO Find X7 BLPA39 Replacement Battery 7.82V 2400mAh

Oppo Find X7 / PHZ110 — 7.82V Li-Polymer Replacement Battery (BLPA39)

This is a 7.82V, 2400mAh Li-Polymer replacement battery for the Oppo Find X7 and PHZ110 smartphones. It slots in as a direct cell swap when the original BLPA39 has degraded past the point of useful daily capacity. Voltage and connector match the OEM spec exactly.

• Find X7 and PHZ110 platform: Both models run on the same internal chassis with identical battery compartment dimensions, connector pinout, and BMS handshake protocol — a single cell fits both without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Find X7 platform. The BMS accepted the cell without error flags, and the charge IC transitioned cleanly through trickle, constant-current, and constant-voltage phases.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes amperage into an uncalibrated state.

Sudden shutdown at 20–30% on the replacement cell

This happens because the fuel gauge IC is still reading the old cell's discharge curve. A new Li-Polymer cell has a steeper voltage drop in the lower charge window than a worn cell does. When the modem or display pulls a high-current spike, the cell voltage collapses below the BMS cutoff threshold before the percentage display catches up. One full discharge-charge cycle — taken all the way to automatic shutoff and then charged uninterrupted to 100% — forces the coulomb counter to recalibrate against the actual cell curve and corrects the early cutoff behaviour.

SUPERVOOC or fast charge not activating after replacement

Oppo's proprietary fast charge protocol requires the BMS to complete a handshake with the charge IC before high-current delivery is allowed. On the first cycle with a new cell, the charge IC may default to standard 5V input until it confirms cell health data from the BMS. Charge the phone once at standard speed with fast charging disabled in settings. After that first full cycle, re-enable fast charging — the handshake should complete and the charger will step up to the full SUPERVOOC voltage tier.