BLU Neo 5.0 Replacement Battery C776040200L 3.7V 1300mAh

BLU Neo 5.0 / N010 Series — 3.7V Li-ion Replacement Battery (C776040200L)

This is a 3.7V, 1300mAh Li-ion cell (4.81Wh) replacement for the BLU Neo 5.0 smartphone, covering models N010, N010L, and N010U. It slots into the same bay as the factory cell and uses the same OEM part number C776040200L. Swap it in when the original cell no longer holds a charge through a normal day of calls and messaging.

• N010, N010L, N010U compatibility: All three Neo 5.0 variants share the same physical bay dimensions (77.08 × 59.72 × 3.94mm), connector pinout, and BMS communication protocol — one cell covers all three without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on Neo 5.0 hardware. The BMS accepted the cell without fault flags, and the charge IC maintained steady current through both the trickle and constant-current phases.
• Fuel gauge recalibration on first use: After installation, run one complete discharge-to-charge cycle with fast charging disabled. The fuel gauge IC in the Neo 5.0 was calibrated to the original cell's discharge curve — giving it one full cycle on the new cell without high-current interruption lets it reset that reference before resuming normal charging.

Why the Neo 5.0 reports wrong battery percentage after a cell swap

The Neo 5.0 uses a coulomb counter that tracks charge in and out against the original cell's capacity profile. When you install a new cell, that stored profile no longer matches the new cell's actual discharge curve. The OS reads a percentage based on stale calibration data, not the real state of charge. One full discharge from 100% to automatic shutoff, followed by a full charge, forces the fuel gauge IC to write a new reference curve to match the replacement cell.

Sudden shutdown at 20–30% remaining on the Neo 5.0

This happens when the cell voltage drops below the modem or display load threshold faster than the fuel gauge predicted. At 20–30% state of charge, a cell with a steep discharge curve can collapse from around 3.6V to below 3.2V in seconds under a voice call or screen-on load spike. The BMS then cuts output to protect the cell, and the phone shuts off even though the percentage showed charge remaining. If this occurs repeatedly after the first full calibration cycle, check that the cell connector is fully seated — a loose contact increases effective internal resistance and accelerates that voltage drop.