BLU Vivo BL-N3150Z Replacement Battery 3.85V 3150mAh

BLU Vivo Series — 3.85V Li-Polymer Replacement Battery (BL-N3150Z)

This is a 3.85V, 3150mAh Li-Polymer battery replacing OEM part BL-N3150Z in BLU Vivo smartphones. It fits the Vivo, V0070, V0090, and Vivo 5R, along with three additional Vivo variants sharing the same connector and BMS handshake. Physical dimensions are 84.40 × 62.30 × 3.40mm — verify clearance inside the chassis before installation.

• Vivo platform compatibility: The V0070, V0090, and Vivo 5R all share the same 3.85V voltage rail, identical flex connector pinout, and BMS communication protocol — which is why one cell revision covers all these variants without modification.
• Bench tested on actual hardware: We cycled this cell through the BLU Vivo charge IC at 3.85V nominal. The BMS accepted the USB charge handshake on the first cycle and held cutoff at the expected 4.35V upper threshold without trips or false full-charge signals.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes into an uncalibrated coulomb counter — which is what causes early percentage jumps.

Sudden shutdown at 20–30% on the BLU Vivo after a cell swap

This is a voltage cliff issue, not a capacity problem. When the modem transmits or the display peaks brightness, load current spikes and the new cell's voltage dips below the BMS cutoff threshold momentarily — even though the fuel gauge still reads 20–30%. The fuel gauge IC was calibrated to the old cell's internal resistance curve and doesn't yet know where this cell's voltage floor sits under load. Run one full discharge to near 3.0V at the cell terminals, then charge uninterrupted to 4.35V — the IC recalibrates and the shutdowns stop.

BLU Vivo percentage jumping erratically after replacement

The coulomb counter inside the fuel gauge IC retains data from the old cell and applies it to the new one immediately after swap — the result is percentage readings that skip or jump by 10–15 points mid-use. This isn't a fault in the cell itself. One complete charge-discharge cycle resets the IC's learned capacity registers to match the actual 3150mAh cell chemistry. After that cycle, percentage readout stabilises and tracks linearly across the discharge curve.