Oppo Realme GT Neo 5SE BLP991 Compatible Battery 7.82V 2650mAh

Oppo Realme GT Neo 5SE — 7.82V Li-Polymer Replacement Battery (BLP991)

This is a 7.82V, 2650mAh (20.72Wh) Li-Polymer cell for the Realme GT Neo 5SE smartphone. It replaces the original BLP991 when the factory cell has degraded, swells, or can no longer hold a usable charge. Voltage and connector match the original board layout.

• Realme GT Neo 5SE fit: The GT Neo 5SE uses a dual-cell Li-Polymer stack running at 7.82V nominal. This replacement matches that stack voltage and the BMS handshake the charge IC expects on the power rail. Any mismatch in nominal voltage causes the charge IC to reject the cell or throttle current immediately.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on GT Neo 5SE hardware. The BMS accepted the cell without fault codes on the first connection, and the charge IC negotiated current without triggering thermal cutoff during the initial cycle.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle at standard current. This allows the fuel gauge IC to map the new cell's discharge curve before high-current fast charging pushes amperage into an uncalibrated cell — preventing false percentage readings early on.

Sudden shutdown at 20–30% on the GT Neo 5SE after a cell swap

This is a voltage cliff issue, not a capacity fault. The GT Neo 5SE's modem and display draw combined current spikes that a freshly installed, uncalibrated cell cannot sustain under load — even when the fuel gauge still reads 20–30%. The cell voltage collapses below the BMS cutoff threshold under that load before the percentage catches up. One full slow-charge cycle lets the coulomb counter build an accurate state-of-charge map for the new cell and eliminates most cliff shutdowns.

USB-PD fast charge not negotiating on the first cycle after replacement

After installing a new BLP991, the GT Neo 5SE may charge at standard 5V/1A instead of the expected fast-charge rate. The charge IC treats a freshly connected cell with no charge history as an unknown source and defaults to a conservative current limit as a protection measure. This is not a fault — it clears after the cell reaches full voltage and the BMS logs its first complete cycle. If fast charging still does not engage after one full cycle, check that the cable supports the required current rating and re-seat the battery connector to confirm contact resistance is not inflating cell impedance readings.