Vivo B-Z7 Replacement Battery 3.91V 4500mAh Li-Polymer

Vivo S17 / V2283A Series — 3.91V Li-Polymer Replacement Battery (B-Z7)

This is the B-Z7 Li-Polymer cell for the Vivo V2283A, S17, V2282A, and V2285A smartphones. It runs at 3.91V nominal and delivers 4500mAh (17.6Wh) of capacity. Swap it in when the original cell no longer holds a charge or causes unexpected shutdowns.

• V2283A / S17 platform fitment: The V2283A, S17, V2282A, and V2285A share the same battery bay geometry, connector pinout, and BMS handshake protocol — one cell covers all of them without modification.
• Bench tested on actual hardware: We cycled this cell through the Vivo charge IC handshake and confirmed the BMS accepted the charge profile without fault codes at both standard and elevated current steps.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-charge cycle at standard current. This lets the fuel gauge IC map its coulomb counter to the new cell's discharge curve before high-current charging begins on an uncalibrated reference.

Sudden shutdown at 20–30% on the V2283A after a cell swap

This happens because the fuel gauge IC still holds the discharge curve of the old, degraded cell. When the new cell's voltage drops under modem or display load, the IC misreads remaining capacity and trips a protective shutdown — even though the cell itself has charge left. The fix is one full uninterrupted discharge to around 3.2V followed by a full charge to 4.35V. After that cycle, the coulomb counter recalibrates and the phantom shutdowns stop.

USB-PD fast charge not activating on the first cycle after replacement

On the first charge after a cell swap, the charge IC may fall back to trickle or standard current because it cannot verify the new cell's internal impedance against a stored baseline. Vivo's charge controller is conservative — it runs a conditioning pass before enabling high-current modes. Let the first charge complete fully at whatever rate the phone accepts. Fast charge typically re-enables automatically from the second cycle onward once the IC has logged a valid impedance reading.