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BB21 6500mAh 3.91V Li-ion Polymer replacement battery for Vivo Y21D Y31 5G Global Version, front view showing battery surface and small 2-pin connector

BB21 6500mAh 3.91V Battery for Vivo Y21D Y31 5G Global Version Replacement

Original price was: $36.99.Current price is: $31.99.

🔘 BB21 6500mAh 3.91V | 🔋 Li-ion Polymer | 📱 For Vivo Y21D Y31 5G Global Version

8 in stock

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SKU: BB21 Category: Tags: , , , ,
📦 Shipping, Warranty & After-Sales Information (Click to expand ▼)

✅ Why Our Warranty Stands Out

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Compare✅ Qingsm Tech⚠️ eBay / AliExpress
Warranty Period90 days from delivery15-30 days from order confirmation
When It Starts📦 Upon delivery⚠️ Upon order confirmation (even before you receive it)
Claims HandlingWe do it directly — email usAutomated dispute system, seller dependent
After Window ExpiresStill can contact us for supportNo recourse, seller can ignore you

🔋 90-day warranty is the industry standard for replacement batteries. Batteries naturally lose capacity over time — this normal wear is not covered. Warranty applies to manufacturing defects only.

📦 Shipping Cost & Delivery Time (Economy Shipping from China)

📦 Note: Batteries are classified as hazardous goods and must be shipped via specialized channels, which may take slightly longer than standard couriers. Delivery times are estimates and may be affected by customs, weather, or other unforeseen circumstances. If your country is not listed in the table below, we are currently unable to ship batteries to that destination.

DestinationFreight (USD)Est. Delivery Time
United States$7.808–15 days
Canada$6.8018–30 days
Mexico$10.0030–60 days
Germany, France, United Kingdom, Greece$6.5018–30 days
Austria, Belgium, Czech Republic, Denmark, Estonia, Hungary, Ireland, Italy, Luxembourg, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland, Ukraine$8.0018–30 days
Croatia, Finland, Lithuania, Latvia, Slovenia$8.0030–50 days
Bulgaria, Romania$14.0030–50 days
South Korea, Japan, Australia, New Zealand, Israel, Malaysia, Singapore, Thailand, Philippines, Kazakhstan$7.5018–30 days
United Arab Emirates, Saudi Arabia, Vietnam, Chile, Peru, Colombia, Brazil$18.0025–60 days

🇧🇷 Note for Brazil: Brazilian customs can occasionally cause delays of up to 80 days or more. And please indicate the recipient's CPF, as it is required for Brazilian customs and shipping. Thanks! We appreciate your understanding.

🇪🇺 Note for EU countries: Due to new EU customs regulations effective July 1, 2026, a flat tariff fee of $4.00 (approx. €3.50) applies to shipments to EU countries. This fee covers customs tariff, handling, and payment processing costs, and will be added at checkout. Thank you for your understanding.

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Description

✅ Condition: New – Factory-tested quality & Warranty

✅ 6500mAh High Capacity – Restores full battery life for Vivo Y21D / Y31 5G

✅ CE / RoHS / UN38.3 Certified

✅ 90-Day Warranty from delivery – Longer coverage than major platforms

✅ Ships in 3-7 days with tracking

🛡️ Shipping Protection Available at Checkout

✅ PayPal Buyer Protection included

✅ 100% Compatibility Guarantee – If it doesn’t fit, we’ll refund you. No questions asked.

⚠️ Low Stock Alert: Only 8 left in stock. Order now to avoid waiting.

Battery model: BB21
Capacity: 6500mAh (typical) / 25.42Wh
Rated voltage: 3.91V
Charge limit voltage: 4.45V
Battery type: Li-ion Polymer (Grade A cells)
Compatible with: Vivo Y21D, Vivo Y31 5G Global Version
Package include: 1 x battery
Restore the reliable battery performance of your Vivo device with this BB21 6500mAh replacement battery. The Vivo Y21D and Vivo Y31 5G Global Version are designed for users who need consistent performance for daily communication, 5G connectivity, and essential tasks. After 1-2 years of regular charging cycles, the original battery’s capacity naturally declines. This Li-ion Polymer battery restores the full 6500mAh capacity, bringing back the consistent daily endurance your device was built for. Built with Grade A cells and multi-layer safety protection against overcharge, over-discharge, and short circuits. CE, RoHS, and UN38.3 certified.
Designed for Reliable Daily Use: The 6500mAh battery in the Vivo Y21D and Y31 5G originally provided dependable endurance for calls, messaging, 5G browsing, and daily tasks. After years of charging cycles, battery capacity degrades significantly. Common symptoms include: the device requiring more frequent charging than when new, unexpected shutdowns at 15-20% battery remaining, slower charging than when new, or visible battery swelling. This replacement restores the original endurance, allowing you to continue using your device without interruption. The BB21 battery uses advanced high-density cell technology with multi-layer safety protection, ensuring reliable performance for years to come.
Compatibility Note: Fits Vivo Y21D and Vivo Y31 5G Global Version only. Please confirm your battery model before ordering — BB21 is printed on your original battery. This battery is NOT compatible with Vivo Y21, Vivo Y31 (non-5G), Vivo Y series other models, or other Vivo devices. The Vivo Y21D and Y31 5G use a specific 6500mAh battery with precise dimensions; using a different battery model may cause improper fit, charging issues, or incorrect battery reporting.

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Frequently Asked Questions

The BB21 battery for Vivo Y21D and Y31 5G is compatible with Vivo Y21D and Vivo Y31 5G Global Version only. If you need a Vivo Y21D battery replacement or a Vivo Y31 5G battery replacement, this BB21 6500mAh battery is the exact match. For BB21 battery for Vivo Y21D compatibility, please verify your device model in Settings > About Phone or check the label on your original battery — the model number is printed there. This battery is NOT compatible with Vivo Y21, Vivo Y31 (non-5G), Vivo Y series other models, or other Vivo devices. If your device battery no longer holds charge as it did when new or shuts down unexpectedly, this BB21 replacement battery will restore the full performance.

The BB21 6500mAh battery for Vivo Y21D and Y31 5G has a typical capacity of 6500mAh (25.42Wh) and a rated voltage of 3.91V, with a charge limit of 4.45V. This BB21 3.91V 6500mAh Li-ion Polymer battery is built with Grade A cells and is CE, RoHS, and UN38.3 certified. For best performance, allow 2-3 full charge cycles after installation to calibrate the battery meter. If your original battery now requires more frequent charging than when new, this replacement will restore the original capacity.

Professional Vivo Y21D battery installation is recommended. Vivo devices have a sealed design with strong adhesive around the back cover. To replace Vivo Y21D battery BB21, the technician must heat the back cover to soften adhesive, carefully pry it open to avoid damaging the display or frame, disconnect the battery's small 2-pin connector, remove the old battery, and install the new BB21 battery before resealing the device. For BB21 battery installation, improper handling can damage the display or compromise the device's sealing. Third-party repair shops typically charge $20-35 for labor. For battery health maintenance: 1) Use the original charger and cable for optimal charging. 2) Keep battery level between 20% and 80% for daily use to maximize the lifespan of the 6500mAh cell. 3) Avoid exposing the device to high temperatures (above 40°C / 104°F), especially while charging. 4) For long-term storage (over 2 months), keep the battery at approximately 40-60% charge. 5) Perform a full calibration cycle after installation: drain the device until it auto-shuts off, then charge uninterrupted to 100%. For battery care tips, stop using immediately if the battery shows any swelling.

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