Oppo A98 BLP989 Replacement Battery 3.87V 5000mAh

Oppo A98 / CPH2529 — 3.87V Li-Polymer Replacement Battery (BLP989)

The BLP989 is a 3.87V, 5000mAh (19.35Wh) lithium-polymer cell that replaces the original battery in the Oppo A98 (CPH2529). It fits directly into the A98 chassis and connects to the same flex cable and BMS contact points as the factory unit. If your A98 no longer holds a charge or shuts down unexpectedly, this cell restores full power capacity.

• A98 / CPH2529 fitment: Both model designations refer to the same hardware — the CPH2529 is the regional identifier for the A98. The BLP989 cell uses the same connector pinout, voltage rails, and BMS handshake as the factory battery, so the phone's charge IC recognises it without firmware issues.
• Bench tested on actual hardware: We ran the BLP989 through charge and discharge cycles on the bench. The BMS accepted the cell correctly, protection cutoffs triggered at expected voltage thresholds, and the charge IC cycled without error flags.
• Fuel gauge recalibration after install: On first use after swapping this cell, disable fast charging and complete one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the coulomb counter IC one clean cycle to map the new cell's discharge curve before high-current charging begins.

Sudden shutdown at 20–30% on the Oppo A98 after a battery swap

This is a voltage cliff issue, not a capacity defect. Under high-load conditions — 5G modem active, screen at full brightness — the cell's voltage drops faster than the fuel gauge IC predicts, tripping the protection cutoff before the displayed percentage reaches zero. The fuel gauge is still calibrated to the old cell's discharge curve, so its percentage reading no longer matches actual cell voltage. One full discharge-charge cycle without fast charging forces the coulomb counter to relearn the curve, and the premature shutdowns stop.

USB-PD or SUPERVOOC fast charge not working on the first cycle after replacement

On the first charge cycle with a new BLP989 cell, the A98's charge IC runs an authentication check against the BMS. If the BMS hasn't completed its initial handshake — which requires the cell to be above approximately 3.5V — the charger drops back to standard 5W input rather than enabling SUPERVOOC. This is normal behaviour and not a fault with the cell or charger. Charge the phone once at standard speed until it reaches 100%, then unplug and reconnect your SUPERVOOC adapter — fast charging will engage from the second cycle onward.