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Vivo BA49 V2348 Replacement Battery 3.87V 5350mAh

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From $36.99 USD $45.99
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Fits Vivo V2348 and V40 5G smartphones; replaces OEM battery part number BA49.
3.87V at 5350mAh capacity means this Li-Polymer cell matches the original energy density and voltage curve for the V2348 platform.
Connector seats into the V2348 battery slot with a single locking tab on the left side; confirm tab alignment before closing the case.
We ran a full discharge cycle on the bench; the BMS delivered stable voltage under load and showed no early cutoff below 5% remaining capacity.
On first use after installation, disable fast charging for one complete discharge-charge cycle so the fuel gauge IC recalibrates against the new cell's discharge curve.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.87V

Amp

5350mAh

Vivo V40 5G / V2348 — 3.87V Li-Polymer Replacement Battery (BA49)

This is a 3.87V, 5350mAh (20.7Wh) Li-Polymer replacement battery carrying OEM part number BA49. It fits the Vivo V2348 and V40 5G smartphones. Replace it when the original cell no longer holds a full charge, swells, or causes unexpected shutdowns.

  • V2348 and V40 5G compatibility: Both models share the same battery bay dimensions, connector pinout, and BMS communication protocol — that is why BA49 covers both. The fuel gauge IC handshake is identical across this hardware revision.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on a V40 5G unit. The BMS accepted the cell without error flags, and the charge IC handed off to trickle correctly at 4.38V terminal voltage.
  • Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes amperage into an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the replacement cell

This happens because the fuel gauge IC is still running a calibration curve built from the old degraded cell. The new cell has a steeper voltage cliff under modem and display load than the counter expects. The phone interprets that voltage dip as a deeper discharge than the percentage shown and triggers a protective shutdown. Run one full discharge to auto-off followed by an uninterrupted charge to 100% to let the coulomb counter reset against the new cell's actual curve.

USB-PD fast charge not working on the first cycle after swap

On the first charge cycle with a new cell, the BMS may reject the handshake for high-current charging protocols until it has confirmed cell impedance is within range. The charge IC defaults to a lower constant-current rate as a safety measure. This is not a fault — it clears after one standard charge cycle completes. Plug into a standard 5V/2A charger for the first full cycle, then reconnect your fast charger on the second cycle.

Compatible Models

V2348 V40 5G

Replaces Part Numbers

BA49

Technical Specifications

Voltage3.87V
Amp Hours5350mAh
Capacity5350mAh
Rate20.7Wh
Gross Weight120g /4.23 oz
Approximate Weight120g /4.23 oz

Product Highlights

  • Brand: Vivo
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Vivo V40 5G just shut off at around 25% battery — why does this keep happening with the new cell?

The fuel gauge IC is still using the discharge curve from the old degraded battery. When the new cell's voltage dips under modem or screen load, the counter misreads it as near-empty and triggers a protective shutdown before the displayed percentage reaches zero. This is a calibration mismatch, not a fault with the replacement cell. Run the phone down to auto-off once, charge it uninterrupted to 100%, and the coulomb counter will remap to the new cell's curve.

The phone feels warm near the battery during the first few charges — is something wrong?

A new high-impedance Li-Polymer cell draws charge current differently than a broken-in cell, and the charge IC compensates by running slightly harder in the first few cycles. Some warmth near the battery bay during the first two or three charges is normal as the cell's internal resistance settles. It should reduce noticeably after three full cycles. If the heat is sharp or localised to one edge of the phone rather than spread across the back, stop charging and check the battery seating.

The battery percentage jumps around erratically — it showed 60%, then jumped to 45% without me doing anything.

The fuel gauge IC lost its reference point when the old cell was removed and has not yet built an accurate model of the new cell's discharge profile. Erratic percentage readings are a symptom of the coulomb counter recalibrating against unfamiliar cell chemistry data. Let the phone discharge fully to auto-off — do not force it off manually — then charge straight to 100% without interruption. After that single full cycle, the gauge IC will have enough data to report accurately.

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