Sale!
BP40 4000mAh 3.85V Li-ion Polymer replacement battery for Redmi K20 Pro and Xiaomi Mi 9T Pro, front view showing battery surface and small 2-pin connector

BP40 4000mAh 3.85V Battery for Redmi K20 Pro Mi 9T Pro Replacement

Original price was: $29.99.Current price is: $24.99.

🔘 BP40 4000mAh 3.85V | 🔋 Li-ion Polymer | 📱 For Redmi K20 Pro / Mi 9T Pro

8 in stock

No PayPal account? 💳 Pay with credit/debit card | 🛡️ PayPal Buyer Protected
SKU: BP40 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, 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.

🔋 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: New – Factory-tested quality & Warranty

✅ 4000mAh High Capacity – Restores full battery life for Redmi K20 Pro / Mi 9T Pro

✅ 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: BP40
Capacity: 4000mAh (typical) / 15.4Wh
Rated voltage: 3.85V
Charge limit voltage: 4.4V
Battery type: Li-ion Polymer (Grade A cells)
Compatible with: Redmi K20 Pro, Xiaomi Mi 9T Pro
Package include: 1 x battery
Restore the reliable battery performance of your Redmi K20 Pro or Mi 9T Pro with this BP40 4000mAh replacement battery. The Redmi K20 Pro features a 6.39-inch AMOLED display and is powered by the Qualcomm Snapdragon 855 processor with 6GB or 8GB RAM. After 1-2 years of regular charging cycles, the original battery’s capacity naturally declines. This Li-ion Polymer battery restores the full 4000mAh 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 4000mAh battery in the Redmi K20 Pro and Mi 9T Pro originally provided dependable endurance for streaming on the AMOLED display, gaming, photography with the 48MP triple camera system, and daily tasks, supporting 27W fast charging for quick recharging. 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 Redmi K20 Pro without interruption. The BP40 battery uses advanced high-density cell technology with multi-layer safety protection, ensuring reliable performance for years to come.
Compatibility Note: Fits Redmi K20 Pro and Xiaomi Mi 9T Pro only. Please confirm your battery model before ordering — BP40 is printed on your original battery. Verify that your current battery matches the model number, rated voltage (3.85V), and capacity (4000mAh / 15.4Wh). This device features a non-removable battery design — professional installation is recommended. Using an incorrect battery model may cause improper fit, charging issues, or incorrect battery reporting.

Discover more from Battery.qingsm.tech

Subscribe to get the latest posts sent to your email.

Reviews

There are no reviews yet.

Be the first to review “BP40 4000mAh 3.85V Battery for Redmi K20 Pro Mi 9T Pro Replacement”

Your email address will not be published. Required fields are marked *
To receive the "Verified Owner" badge, please use the same email address you used when placing your order.

Frequently Asked Questions

The BP40 4000mAh battery for Redmi K20 Pro is compatible with Redmi K20 Pro and Xiaomi Mi 9T Pro. If you need a Redmi K20 Pro battery replacement or Mi 9T Pro battery replacement, this BP40 4000mAh battery is the exact match. For BP40 battery for Redmi K20 Pro compatibility, please verify your device model in Settings > About Phone or check the label on your original battery — the model number BP40 is printed there. The Redmi K20 Pro features a 6.39-inch AMOLED display and Snapdragon 855 processor. If your Redmi K20 Pro battery no longer holds charge as it did when new or shuts down unexpectedly, this BP40 replacement battery will restore the full performance.

The BP40 4000mAh battery for Redmi K20 Pro has a typical capacity of 4000mAh (15.4Wh) and a rated voltage of 3.85V, with a charge limit of 4.4V. This BP40 3.85V 4000mAh Li-ion Polymer battery is built with Grade A cells and is CE, RoHS, and UN38.3 certified. BP40 battery specifications are designed for reliable daily performance. For best performance, allow 2-3 full charge cycles after installation to calibrate the battery meter. If your original Redmi K20 Pro battery now requires more frequent charging than when new, this replacement will restore the original capacity.

Professional Redmi K20 Pro battery installation is recommended. The Redmi K20 Pro has a sealed design with an internal battery. To replace Redmi K20 Pro battery BP40, the technician must heat the back cover to soften adhesive, carefully pry it open to avoid damaging the AMOLED display or frame, disconnect the battery's small 2-pin connector, remove the old battery, and install the new BP40 battery before resealing the device. For BP40 battery installation Redmi K20 Pro, improper handling can damage the display or compromise the device's sealing. Third-party repair shops typically charge $20-35 for labor. For Redmi K20 Pro battery health maintenance: 1) Use the original 27W charger and cable for optimal charging. 2) Keep battery level between 20% and 80% for daily use to maximize the lifespan of the 4000mAh 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 Redmi K20 Pro battery care tips, stop using immediately if the battery shows any swelling.

Related products

✅ Ready to order?

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

👉 Add to Cart Now