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BN51 5000mAh 3.85V Li-Polymer replacement battery for Xiaomi Redmi 8, front view on white background
BN51 5000mAh 3.85V Li-Polymer replacement battery for Xiaomi Redmi 8, front view on non-white background showing battery surface and connector
Back view of BN51 5000mAh 3.85V Li-Polymer replacement battery for Redmi 8 and Redmi 8A

BN51 5000mAh 3.85V Battery for Xiaomi Redmi 8 8A 18W Fast Charging

Original price was: $15.99.Current price is: $11.99.

🔘 BN51 5000mAh 3.85V | 🔋 Li-Polymer | 📱 For Xiaomi Redmi 8 / 8A (18W)

8 in stock

No PayPal account? 💳 Pay with credit/debit card | 🛡️ PayPal Buyer Protected
SKU: BN51 Category: Tags: , , , ,
📦 Shipping, Warranty & After-Sales Information (Click to expand ▼)

✅ Why Our Warranty Stands Out

Unlike marketplace sellers with short buyer protection windows, we handle claims directly — no automated disputes, no endless back-and-forth.

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, Cyprus, Czech Republic, Denmark, Estonia, Hungary, Ireland, Italy, Luxembourg, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland$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.

🔋 Can't find your battery model? Use our FREE Battery Lookup Service – tell us your device and we'll find a match within 24 hours. 👉 battery.qingsm.tech/find-my-battery

Description

✅ Condition: Brand New – Never used, factory-tested quality

✅ CE / RoHS / UN38.3 Certified – Safety tested

✅ 5000mAh High Capacity – Supports 18W fast charging

✅ 90-Day Warranty – Hassle-free replacement

✅ Ships in 3-7 days with tracking – Fast delivery

🛡️ Shipping Protection Available at Checkout – Covered against loss, damage, or theft

✅ PayPal Buyer Protection included – Secure checkout

✅ 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: BN51
Battery capacity: 5000mAh (typical) / 19.25Wh
Rated voltage: 3.85V
Charge limit voltage: 4.4V
Battery type: Li-Polymer
Compatible with: Xiaomi Redmi 8, Redmi 8A
Package include: 1 x battery
Restore the legendary battery life of your Redmi 8 or Redmi 8A with this BN51 5000mAh replacement battery. Both models feature massive 5000mAh batteries designed for all-day endurance. This Li-Polymer cell delivers reliable power for calls, messaging, and media playback — and fully supports 18W fast charging. Built-in multi-layer safety protection guards against overcharge, over-discharge, and short circuits. Made with grade A cells. CE, RoHS, and UN38.3 certified for safety compliance.
Compatibility Note: Fits Xiaomi Redmi 8 and Redmi 8A only. Both models use the same BN51 battery. Professional installation recommended as the battery is not user-replaceable. Please check your original battery model before purchasing.
Battery Care Tips: Avoid full discharge (keep above 20%). Keep away from high temperatures. If swelling occurs, stop use immediately. For best performance, use the original 18W charger that came with your device.

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Frequently Asked Questions

The BN51 battery is compatible with Xiaomi Redmi 8 and Redmi 8A. Both phones feature a 5000mAh battery design and support 18W fast charging. If your Redmi 8 or Redmi 8A battery is draining too fast or not holding a charge, this is the correct replacement. Please check your original battery model before purchasing.

Yes, this BN51 battery fully supports the 18W fast charging capability of Redmi 8 and Redmi 8A. The original 18W charger can charge the 5000mAh battery from 0 to approximately 50% in about 45 minutes. If you need a high-capacity replacement battery for Redmi 8A to support all-day use, this Li-Polymer cell is a reliable choice. Made with grade A cells, CE, RoHS, and UN38.3 certified.

The original Redmi 8 and 8A both use 5000mAh batteries. However, some third-party sellers offer lower-cost 4000mAh versions that are not original spec. This listing is for the full 5000mAh capacity version that matches the original specifications. Flipkart sellers in India also offer BN51 batteries, but many are 4000mAh variants. Always check the capacity before purchasing. For best results, use the original 18W charger that came with your device.

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This battery is in stock and ready to ship within 3-7 days. 90-day warranty included.

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