G-SHOT BLI-248 Compatible Battery G512 3.7V 750mAh Li-ion

G-SHOT G512 / G515 — 3.7V Li-ion Replacement Battery (BLI-248)

This is a 3.7V 750mAh Li-ion cell for the G-SHOT G512 and G515 smartphones. It replaces OEM part BLI-248 when the original cell degrades, fails to hold charge, or stops accepting a charge entirely. Dimensions are 53.49 × 33.44 × 6.91 mm — confirm these against your existing cell before installing.

• G512 and G515 compatibility: Both models share the same battery bay dimensions, connector pinout, and BMS communication protocol, which is why a single cell covers both. Swapping between the two devices is not recommended — each phone's charge IC is calibrated to its own fuel gauge history.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the G512 platform. The BMS accepted the handshake on first connection, charge IC ramped to CC phase normally, and cutoff triggered cleanly at 4.2V with no thermal events.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell — preventing erratic percentage readings from the first hour.

Sudden shutdown at 20–30% on a replacement cell

A new cell in a phone with an old fuel gauge IC calibration will shut down well above 0% — typically between 20% and 30%. The fuel gauge is still reading the discharge curve of the original degraded cell, so it hits its low-voltage cutoff threshold earlier than the actual state of charge warrants. Under modem load or screen-on load, the voltage drop across the new cell is steeper than the IC expects, triggering an emergency cutoff. Run one full uninterrupted discharge to below 5% followed by a full charge to 100% to push the coulomb counter to its reset points and rebuild an accurate curve.

Phone shows wrong battery percentage after cell swap

The fuel gauge IC stores a learned discharge model tied to the original cell's internal resistance and capacity fade profile. A fresh 750mAh cell has a completely different impedance curve, so percentage readings will jump, stall, or read high until the IC relearns. This is not a fault with the replacement cell — it is the IC recalibrating. Complete two full discharge-charge cycles with fast charging disabled, and the percentage display should stabilise by the end of the second cycle.