About this replacement
OnePlus 10 Pro / 10 Pro 5G — 7.74V Li-Polymer Replacement Battery (BLP899)
This is a 7.74V, 2400mAh Li-Polymer replacement battery for the OnePlus 10 Pro and 10 Pro 5G. It carries OEM part number BLP899 and fits the internal battery bay on both variants of this model. Capacity rating is 18.58Wh drawn directly from product specification — not a web estimate.
- 10 Pro and 10 Pro 5G compatibility: Both the standard and 5G variants of the OnePlus 10 Pro use the same BLP899 battery footprint, connector pinout, and BMS handshake. The shared voltage rail and physical dimensions — 86.30 × 63.00 × 5.50mm — mean one part number covers both boards.
- Bench tested on actual hardware: We ran the BLP899 cell through charge and discharge cycles on a 10 Pro board. The BMS accepted the cell, thermal monitoring stayed within normal range, and the fuel gauge IC began tracking the new discharge curve from the first full cycle.
- First-cycle fast charge protocol: After installation, disable SUPERVOOC fast charging for the first complete discharge-charge cycle. The fuel gauge IC needs one full cycle to recalibrate against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.
Why the OnePlus 10 Pro reports wrong battery percentage after a cell swap
The 10 Pro uses a coulomb counter in the fuel gauge IC to track charge state. That counter was calibrated against the original cell's discharge curve over months of use. When a new cell goes in, the stored curve no longer matches actual cell behaviour, so the percentage reading drifts — often reading higher than real capacity until recalibration. Run one full discharge to approximately 3.0V per cell, then charge uninterrupted to 100% without unplugging early. After that single cycle, the fuel gauge IC resets its reference points and percentage accuracy returns to normal.
Sudden shutdown at 20–30% on the replacement BLP899
This shutdown pattern means the cell voltage is dropping below the board's cutoff threshold under load — even though the fuel gauge still shows charge remaining. It happens when the fuel gauge IC hasn't completed recalibration and overestimates remaining capacity at low state of charge. The modem and display together draw enough current to cause a rapid voltage sag the uncalibrated gauge can't predict. Complete one full uninterrupted discharge-charge cycle; on that cycle, watch for the phone to reach 3.5V resting voltage before the gauge recalibrates and shutdowns stop.