Vivo Y97 B-E8 Replacement Battery 3.85V 3250mAh

Vivo Y97 / V1813 Series — 3.85V Li-Polymer Replacement Battery (B-E8)

This is a 3250mAh Li-Polymer battery for the Vivo Y97, V1813, V1813T, and V1813A smartphones. It replaces OEM part number B-E8 and matches the original voltage and physical dimensions. Swap it in when the original cell degrades, swells, or no longer holds charge.

• Y97 / V1813 platform fit: All four model variants — Y97, V1813, V1813T, and V1813A — share the same battery bay dimensions, flex connector pinout, and charge IC expectations. One cell covers the full range without any modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a V1813-series board. The BMS accepted the charge IC handshake cleanly, and cell voltage held at 3.85V nominal throughout the discharge curve without premature cutoff.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. The fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve. Running fast charging before that first full cycle pushes high current into an uncalibrated cell, which can throw percentage readings off for weeks.

Sudden shutdown at 20–30% on the Vivo Y97

This is a voltage cliff, not a capacity problem. When the modem fires during a call or the screen peaks at full brightness, the cell has to deliver a short burst of high current. An aged or degraded cell cannot sustain voltage under that load and drops below the BMS cutoff threshold — even if the fuel gauge still shows 25%. The phone shuts down to protect the board. Replacing the cell removes the cliff, but the fuel gauge IC still needs one full discharge-charge cycle to remap the new cell's voltage-to-percentage curve and stop reporting early shutdowns after the swap.

Phone won't power on after sitting in a drawer for months

Li-Polymer cells self-discharge in storage. If the cell drops below roughly 2.5V, the BMS trips a lockout to prevent charging a critically depleted cell at full current. The phone appears completely dead — no boot, no charge indicator. Connect a charger and leave it for 15–30 minutes before pressing the power button; the charge IC trickle-charges the cell back above the BMS recovery threshold first. If the indicator still does not appear after 30 minutes, try a second cable and charger combination before assuming the cell is the fault.