BLU Vivo 5 Replacement Battery 3.85V 3050mAh Li-Polymer

BLU Vivo 5 (V0050UU) — 3.85V Li-Polymer Replacement Battery

This 3.85V, 3050mAh lithium-polymer cell replaces the original battery in the BLU Vivo 5 (model V0050UU). It fits directly into the existing battery bay and connects to the same flex connector the factory cell uses. Dimensions are 84.90 × 63.05 × 3.75mm — confirm against your existing cell before installing.

• Vivo 5 and V0050UU fit: Both model references share the same PCB layout, connector pinout, and charge IC. One cell covers both.
• Bench tested on actual hardware: We ran this cell through the BLU charge IC and confirmed BMS handshake, full charge acceptance to 4.35V, and stable discharge curve under mixed screen and modem load — no premature cutoff triggered.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and let the phone complete one full discharge-to-charge cycle. This gives the coulomb counter a clean reference curve before high-current charging begins against an uncalibrated cell.

Sudden shutdown at 20–30% on the BLU Vivo 5

This is a voltage cliff, not a capacity problem. When the modem or display pulls a spike of current, a cell with a steep discharge curve drops voltage faster than the fuel gauge expects. The system registers that as a critical low-voltage event and shuts down even though the reported percentage looks safe. Running one full discharge cycle from 100% to automatic shutdown lets the coulomb counter map the actual voltage curve of the new cell and correct the percentage readings going forward.

Phone not powering on after the replacement battery sat in storage

Lithium-polymer cells that self-discharge below approximately 2.5V per cell trigger a BMS lockout as a protection measure. The phone shows nothing — no charge animation, no bootloop. Connect the phone to a wall charger, not a PC port, and leave it for 20–30 minutes without pressing any button. Most BMS circuits begin a trickle pre-charge at low voltage; once the cell climbs above the lockout threshold, the charge animation appears and normal charging resumes.