Realme GT Neo 5SE BLP991 Replacement Battery 7.82V 2650mAh

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

The BLP991 is a 7.82V, 2650mAh Li-Polymer cell that replaces the original battery in the Realme GT Neo 5SE smartphone. It fits the GT Neo 5SE directly and restores power to the processor, display, modem, and all system functions. Use this when the original cell no longer holds charge, causes early shutdowns, or has degraded through repeated charge cycles.

• GT Neo 5SE fit: The BLP991 part number is specific to the GT Neo 5SE. The connector, cell dimensions, and BMS handshake all match the original Realme power management IC — no adapter or modification needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the GT Neo 5SE platform. The BMS accepted the cell without triggering thermal cutoff or charge rejection, and the fuel gauge IC tracked state-of-charge correctly after one full cycle.
• First-cycle fast charge handling: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current fast charging pushes current into an uncalibrated cell.

Why the GT Neo 5SE reports wrong battery percentage after a cell swap

The GT Neo 5SE uses a coulomb counter and fuel gauge IC that builds its charge model from the previous cell's discharge curve. When you swap to a new BLP991, the stored model no longer matches the actual cell chemistry and impedance. The percentage readout will drift — often reading higher or lower than the true state of charge. One full discharge to auto-shutdown followed by a complete charge to 100% at standard rate forces the IC to rewrite its curve against the new cell.

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

This happens when the modem, display, or CPU draws a short high-current burst and the cell voltage drops below the BMS protection threshold — even though the fuel gauge still shows charge remaining. The GT Neo 5SE's power rail will cut out if cell voltage dips below roughly 3.4V per cell under load. The fix is the same recalibration cycle: drain to auto-shutdown, charge fully, and let the fuel gauge IC re-anchor its low-voltage cliff point to the new cell's actual curve.