BLU Vivo XI Replacement Battery 3.8V 2900mAh C736241300P

BLU Vivo XI — 3.8V Li-Polymer Replacement Battery (C736241300P)

This is a 3.8V, 2900mAh lithium-polymer battery that replaces part number C736241300P in the BLU Vivo XI smartphone. It fits the V0330WW and V0320VV hardware variants as well. The cell matches the original voltage rail and physical footprint at 75.96 × 62.25 × 4.50mm.

• Vivo XI, V0330WW, and V0320VV compatibility: All three variants share the same battery bay geometry, connector pinout, and BMS communication protocol — so a single cell covers the full production run without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Vivo XI platform. The BMS accepted charge handshake on the first connection and held voltage within spec across the discharge curve without triggering an early cutoff.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before fast charging pushes higher current into an uncalibrated cell.

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

A fresh lithium-polymer cell has a steeper voltage cliff than a worn original — the phone's fuel gauge IC is still reading the old discharge curve and misjudges remaining capacity. When a high-draw event hits (screen at full brightness, LTE handoff, or GPS active), the new cell's voltage drops briefly below the shutdown threshold before the reported percentage reaches zero. The fix is a full calibration cycle: drain the phone to automatic shutdown, then charge uninterrupted to 100% with fast charging off. After one full cycle the coulomb counter aligns to the new cell and the early shutdowns stop.

USB fast charge not activating after battery replacement

The Vivo XI's charge IC uses a handshake sequence to verify cell impedance before enabling elevated charge current. On the first cycle with a new cell, the BMS may return an impedance value outside the expected window, causing the charge IC to fall back to standard 5V charging. This is not a fault — it clears after one standard charge cycle as the BMS logs the new cell's baseline. Plug in with a 5V/2A charger, let the phone charge fully without interruption, and fast charge will re-enable on the next connection.