Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Vivo X50 Pro B-N3 Replacement Battery 3.87V 4200mAh

Up to 21% off
New arrival
From $26.99 USD $33.99
Shipping calculated at checkout.
Fits Vivo X50 Pro, X50 Pro 5G, X51 5G, and V2005 — replaces OEM part B-N3.
3.87V at 4200mAh capacity sustains the X50 Pro through a full day of calls, apps, and media without voltage sag under modem load.
Connector type is standard smartphone pogo — seats flat against the device frame with no locking tab; orientation is keyed to prevent reverse insertion.
We tested the B-N3 on a bench charger cycle — BMS accepted the 5V input, fuel gauge IC initialized without fault codes, and discharge curve held steady under sustained 2A drain.
On first use after installation, disable fast charging for one complete discharge-charge cycle — this lets the fuel gauge IC recalibrate against the new cell's discharge curve before USB-PD pushes current into an uncalibrated BMS.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
WECARE5

Please Confirm Delivery Timeline

Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
4.8
★★★★★
★★★★★
Average Customer Rating
By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 12 reviews

I'm writing this review to express my deep gratitude and appreciation for the quality of services provided to me by the BatteryWeb service team. I visited BatteryWeb to purchase a replacement battery for my Remington R9 razor. The staff was very responsive and I was really impressed with their willingness to help me and make the purchasing process as quick as possible. In particular I greatly appreciate the work of staff member Shane who was friendly and helpful.
In conclusion, I believe that BatteryWeb has excellent service staff who make their customers feel honored and valued.
I wish you all the best.
Sincerely,
Michael

Michael Talianker
BatteryWeb

this battery was just what I needed.

Robert Jones
BatteryWeb

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

Great deal for the money.

Linda M.
BatteryWeb

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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

4200mAh

Vivo X50 Pro / X51 5G — 3.87V Li-Polymer Replacement Battery (B-N3)

The B-N3 is the OEM-matched Li-Polymer cell for the Vivo X50 Pro, X50 Pro 5G, X51 5G, and V2005. It runs at 3.87V with a 4200mAh (16.25Wh) capacity — the same electrical spec as the original cell. Fits the standard connector and sits within the original battery bay dimensions of 76.70 × 62.45 × 4.60mm.

  • X50 Pro and X51 5G platform compatibility: Both devices share the same battery bay dimensions, voltage rail, and BMS handshake protocol, which is why a single B-N3 cell covers the full lineup. The connector pinout and charge IC communication are identical across V2005 and the 5G variants.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on an X50 Pro unit. The BMS accepted the cell without error flags, charge IC communication stayed stable throughout, and voltage held steady under screen and modem load.
  • 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 its coulomb counter to the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.

Sudden shutdown at 20–30% on the X50 Pro after a cell swap

A new cell has a slightly different voltage-versus-capacity curve than the worn cell the fuel gauge IC was calibrated against. When the phone hits the old cell's low-voltage cliff — around 3.5V under modem or display load — the BMS cuts power even though usable capacity remains. The fuel gauge reports 20–30% because it's reading a curve that no longer matches the new cell. One full slow discharge to shutdown followed by a complete charge to 100% resets the coulomb counter to the correct curve.

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

The X50 Pro's charge IC uses a handshake with the BMS to confirm cell state before enabling high-current fast charge. On a freshly installed cell with no charge history, the BMS reports an unknown state and the charge IC defaults to standard 5V input as a protection measure. This is not a fault — it clears after the first complete charge cycle. Connect to the original Vivo charger, let it complete a full charge to 100%, and fast charge will activate from the second cycle onward.

Compatible Models

X50 Pro X50 Pro 5G X51 5G V2005 V2005A

Replaces Part Numbers

B-N3

Technical Specifications

Voltage3.87V
Amp Hours4200mAh
Capacity4200mAh
Rate16.25Wh
Net Weight54.4g /1.92 oz
Gross Weight104.4g /3.68 oz
Approximate Weight104.4g /3.68 oz
Dimension 76.70 x 62.45 x 4.60mm

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

Why does my Vivo X50 Pro show the wrong battery percentage after fitting the B-N3 replacement?

The fuel gauge IC stores a discharge curve calibrated to the original cell. When a new cell goes in, the coulomb counter is still mapping against the old curve, so percentage readings drift — often showing full at a lower actual charge, or dropping sharply mid-use. Run one complete slow charge to 100% with fast charging disabled, then drain fully until the phone shuts off. That single cycle resets the fuel gauge to the new cell's curve and percentage readings stabilise.

My X50 Pro won't power on at all after the replacement battery sat in a drawer for a few months — what happened?

Li-Polymer cells self-discharge in storage, and if the B-N3 dropped below approximately 2.5V per cell, the BMS entered lockout mode to prevent damage. The phone won't respond to the power button because the BMS is blocking output until voltage recovers. Connect the original Vivo charger and leave it for 20–30 minutes without pressing anything — the charge IC will trickle current into the cell to bring it above the BMS re-initialisation threshold. Once voltage recovers to around 3.0V, the BMS unlocks and the phone will power on normally.

The back of my X50 Pro gets noticeably warm near the battery during the first few charges — is something wrong?

This is expected behaviour on the first one to three charge cycles with a new cell. A fresh Li-Polymer cell has higher internal impedance than a broken-in cell, so the charge IC dissipates more energy as heat while current flows into it. Warmth concentrated near the battery bay — not the charging port or processor area — points directly to this cause. It reduces significantly after two or three full cycles as impedance drops; if the heat persists beyond the third full charge, check that the charge IC is not running a continuous fast-charge session by disabling and re-enabling fast charging in the battery settings.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Vivo X50 Pro Replacement Battery, 3.87V, 4200mAh, Li-Polymer 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections