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Vivo X70 Pro B-R6 Replacement Battery 3.87V 4350mAh

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From $26.99 USD $33.99
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Fits Vivo X70 Pro, X70 Pro 5G, and V2105 models; replaces OEM part B-R6.
3.87V at 4350mAh capacity restores full charge cycles on this flagship's processor and display load.
Connector slides straight into the battery slot; ensure the retention clip seats flush before reassembly.
We bench-tested this cell against the fuel gauge IC; BMS accepted charge without early cutoff flags.
On first use after installation, disable fast charging for one complete discharge-charge cycle to recalibrate the coulomb counter against the new cell's discharge curve.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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

4350mAh

Vivo X70 Pro / V2105 — 3.87V Li-Polymer Replacement Battery (B-R6)

This is a 3.87V, 4350mAh Li-Polymer cell that replaces the original B-R6 battery in the Vivo X70 Pro, X70 Pro 5G, and V2105. It fits the same footprint at 75.10 × 62.34 × 5.00mm and connects to the same charge IC and fuel gauge already on the board. Swap this in when the original cell no longer holds voltage under display or modem load.

  • X70 Pro and V2105 fitment: Both the X70 Pro and V2105 share the same PCB layout, connector position, and BMS handshake protocol — that is why a single B-R6 cell covers all three model variants without modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on the X70 Pro board, confirmed BMS communication remained stable across the complete voltage window from 4.40V down to 3.00V, and verified the charge IC accepted the cell without triggering a fault flag.
  • Fuel gauge recalibration on first use: 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 runs against an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the replacement cell

This happens because the fuel gauge IC is still referencing the discharge curve of the old, degraded cell. When the new cell's actual voltage drops under modem or display load, the IC misreads remaining capacity and triggers a low-voltage shutdown earlier than the percentage shown. The fix is one full uninterrupted discharge to 0% followed by a complete charge to 100% with fast charging off. After that cycle, the coulomb counter resets against the new cell's curve and shutdowns at false percentages stop.

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

On the first charge after a cell swap, Vivo's proprietary charge protocol may not handshake correctly between the charger and the new cell's BMS. The phone falls back to standard 5V charging as a safety default. This is not a fault with the cell — the BMS needs one standard charge cycle to initialise communication with the charge IC. Plug in using the original Vivo charger, let the first cycle complete at standard rate, and fast charging resumes on the next plug-in.

Compatible Models

X70 Pro X70 Pro 5G V2105

Replaces Part Numbers

B-R6

Technical Specifications

Voltage3.87V
Amp Hours4350mAh
Capacity4350mAh
Rate16.83Wh
Net Weight57g /2.01 oz
Gross Weight107g /3.77 oz
Approximate Weight107g /3.77 oz
Dimension 75.10 x 62.34 x 5.00mm

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 is my Vivo X70 Pro showing the wrong battery percentage after fitting the B-R6 replacement?

The fuel gauge IC on the X70 Pro calibrates its percentage readings against the discharge curve of the cell it last learned. A new B-R6 cell has a different internal resistance profile than the worn-out original, so the coulomb counter reports stale figures until it relearns. Run one full discharge down to shutdown and charge back to 100% with fast charging disabled. After that single cycle, the fuel gauge IC recalibrates and percentage accuracy returns.

The phone won't power on at all after the replacement battery sat in storage — what's wrong?

If the B-R6 cell discharged below approximately 2.5V during storage, the BMS enters a lockout state to prevent damage to the cell. The phone will not respond to the power button and may show no charge indicator. Connect the original Vivo charger and leave it for 15–20 minutes without pressing anything — the charge IC will trickle current into the cell until it recovers above the BMS re-enable threshold, at which point the phone boots normally.

The phone feels warm near the battery area during the first few charges — is that a problem with this cell?

A new Li-Polymer cell has slightly higher internal impedance than a cell that has been through several charge cycles. The charge IC pushes current into a higher-resistance load on those first cycles, which generates more heat than you will see later. Keep the phone out of a case for the first two or three charges so heat can dissipate freely. If the back stays warm past the fourth charge cycle, check that no background apps are running heavy CPU loads while charging.

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