BLP699 OnePlus 7 Pro Replacement Battery 3.85V 3900mAh

OnePlus 7 Pro / GM1910 — 3.85V Li-Polymer Replacement Battery (BLP699)

The BLP699 is a 3900mAh Li-Polymer cell at 3.85V, built as a direct cell swap for the OnePlus 7 Pro and its GM1910 variants, including the Premium Edition and Premium Edition Dual SIM. It restores charge capacity lost through normal degradation cycles. Dimensions are 64.10 × 61.30 × 5.83mm — measure your original cell before installing.

• GM1910 and Premium Edition variants: All listed variants share the same battery bay geometry, connector pinout, and BMS handshake protocol. The BLP699 part number applies across the full 7 Pro lineup regardless of regional SKU or dual-SIM configuration.
• Bench tested on actual hardware: We ran this cell on a GM1910 unit. The BMS accepted charge handshake on first connection, thermal sensors reported correctly through Warp Charge negotiation, and the protection circuit tripped cleanly at the expected low-voltage cutoff.
• Fuel gauge recalibration after install: On first use, disable Warp Charge in settings and run one full discharge-to-charge cycle at standard 5V input. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the BLP699 replacement cell

This is a voltage cliff problem, not a capacity problem. Under high-load conditions — 5G modem polling, screen at peak brightness, or background sync — the cell voltage drops faster than the fuel gauge IC expects based on its stored discharge curve. The phone's protection circuit reads the sag as a critical low-voltage event and cuts power before the reported percentage reaches zero. One full slow-charge cycle recalibrates the coulomb counter and eliminates most occurrences. If shutdowns continue after recalibration, check that the connector is fully seated — a loose contact increases internal resistance and worsens voltage sag under load.

Warp Charge not activating after cell replacement

The OnePlus Warp Charge protocol requires a handshake between the charge IC on the phone and the cable or adapter — but the BMS on a new cell can affect how that handshake completes on the first cycle. If the phone charges slowly or the Warp Charge indicator never appears, run one full charge at standard USB-C 5V/2A first. After that cycle completes and the fuel gauge IC has baseline data, reconnect the Warp Charge adapter. The protocol should negotiate correctly from the second cycle onward. Confirm you are using the original OnePlus adapter — third-party chargers do not carry the Warp handshake signal.