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BM3B 3400mAh 3.85V Li-ion Polymer replacement battery for Xiaomi Mi Mix 2 and Mi Mix 2S, front view showing battery surface and small 2-pin connector

BM3B 3400mAh 3.85V Battery for Mi Mix 2/2S Replacement

Original price was: $24.99.Current price is: $17.99.

🔘 BM3B 3400mAh 3.85V | 🔋 Li-ion Polymer | 📱 For Xiaomi Mi Mix 2/2S

8 in stock

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SKU: BM3B Category: Tags: , , , ,
📦 Shipping, Warranty & After-Sales Information (Click to expand ▼)

✅ Why Our Warranty Stands Out

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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.

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Description

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

✅ 3400mAh High Capacity – Restores full battery life for Xiaomi Mi Mix 2 and Mi Mix 2S

✅ 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: BM3B
Capacity: 3400mAh (typical) / 13.09Wh
Rated voltage: 3.85V
Charge limit voltage: 4.4V
Battery type: Li-ion Polymer (Grade A cells)
Compatible with: Xiaomi Mi Mix 2, Xiaomi Mi Mix 2S
Package include: 1 x battery
Restore the flagship-level performance of your Xiaomi Mi Mix 2 or Mi Mix 2S with this BM3B 3400mAh replacement battery. Launched in 2017 and 2018 respectively, the Mi Mix 2 and Mi Mix 2S are iconic ceramic-bodied smartphones designed by Philippe Starck. The Mi Mix 2S features the Qualcomm Snapdragon 845 processor and a 12MP dual-camera system, while the Mi Mix 2 is powered by the Snapdragon 835. Both devices are celebrated for their premium ceramic build and near-bezel-less displays. After years of daily charging cycles, the factory battery capacity naturally degrades. This Li‑ion Polymer battery restores the full 3400mAh capacity, bringing back the dependable endurance these flagship devices were designed 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 Flagship Performance: The Xiaomi Mi Mix 2 and Mi Mix 2S are built around a 3400mAh battery that delivers solid all‑day endurance for productivity, photography, and entertainment. Both devices support Qualcomm Quick Charge 3.0. After extended use, the original battery capacity degrades significantly. Common symptoms include: the device requiring more frequent charging, unexpected shutdowns at 15‑25% battery remaining, slower charging than when new, or visible battery swelling. This BM3B replacement battery restores the factory‑spec 3400mAh capacity and supports the original Quick Charge 3.0 capability. The battery uses high‑density cell technology with precise voltage control, ensuring stable output and compatibility with the device’s original charging circuitry.
Compatibility Note: Fits Xiaomi Mi Mix 2 and Mi Mix 2S only. Please confirm your battery model before ordering — BM3B is printed on your original battery. This battery is NOT compatible with Xiaomi Mi Mix, Xiaomi Mi Mix 3, Xiaomi Mi 8, or other Xiaomi models. The Mi Mix 2 and 2S share the same BM3B battery design with specific dimensions and connector layout; using a different battery model may cause charging issues or incorrect battery reporting.

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Frequently Asked Questions

The BM3B 3400mAh battery replacement is compatible with Xiaomi Mi Mix 2 and Xiaomi Mi Mix 2S. If you need a BM3B battery for Mi Mix 2 or a BM3B battery for Mi Mix 2S, this replacement battery is the exact match. Both devices feature premium ceramic builds and are powered by Snapdragon 800-series processors. For BM3B battery compatibility, please verify your battery model printed on the original unit — BM3B is the correct model for these devices. This battery is NOT compatible with Xiaomi Mi Mix, Mi Mix 3, Mi 8, or other Xiaomi models. If your current Mi Mix 2 or Mi Mix 2S battery now drains quickly or shuts down unexpectedly, this BM3B 3.85V 3400mAh Li‑ion Polymer battery will restore full endurance and reliability.

The BM3B 3400mAh battery for Xiaomi Mi Mix 2 and Mi Mix 2S has a typical capacity of 3400mAh (13.09Wh) and a rated voltage of 3.85V, with a charge limit of 4.4V. This BM3B 3.85V 3400mAh Li‑ion Polymer battery is built with grade A cells and is CE, RoHS, and UN38.3 certified. For BM3B battery performance, the battery supports the original Qualcomm Quick Charge 3.0 of both devices. For best BM3B battery performance Mi Mix 2S, allow 2‑3 full charge cycles after installation to calibrate the battery meter. If your original Mi Mix 2 battery now requires more frequent charging instead of lasting as it did when new, this replacement will restore the full 3400mAh capacity and fast charging speed.

Professional BM3B battery installation is recommended for Xiaomi Mi Mix 2 and Mi Mix 2S. These devices have a sealed ceramic back with strong adhesive. To replace BM3B battery in Mi Mix 2 or replace BM3B battery in Mi Mix 2S, the technician must heat the back cover to soften adhesive, carefully pry it open to avoid damaging the ceramic back or internal components, disconnect the battery's small 2‑pin connector, remove the old battery, and install the new BM3B battery before resealing. For BM3B battery installation, improper handling can crack the ceramic back or damage internal components. For BM3B battery health maintenance and Mi Mix 2 battery care tips: 1) Use the original charger and cable for optimal Quick Charge 3.0 speed. 2) Keep battery level between 20% and 80% for daily use to maximize the lifespan of the 3400mAh cell. 3) Avoid exposing the phone 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 phone until it auto‑shuts off, then charge uninterrupted to 100%. For BM3B battery care tips Mi Mix 2S, stop using immediately if the battery shows any swelling.

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