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BM3E 3400mAh 3.85V Li-ion Polymer replacement battery for Xiaomi Mi 8 M1803E1A, front view showing battery surface and small 2-pin connector
BM3E 3400mAh 3.85V replacement battery for Xiaomi Mi 8 M1803E1A M1803E1T, back view showing model number BM3E, capacity 3400mAh, and voltage 3.85V on spec label

BM3E 3400mAh 3.85V Battery for Xiaomi Mi 8 M1803E1A M1803E1T Replacement

Original price was: $21.99.Current price is: $15.99.

🔘 BM3E 3400mAh 3.85V | 🔋 Li-ion Polymer | 📱 For Xiaomi Mi 8 M1803E1A/M1803E1T QC4+ 18W Fast Charging

8 in stock

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📦 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 8

✅ 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: BM3E
Capacity: 3400mAh / 13.09Wh
Rated voltage: 3.85V
Charge limit voltage: 4.4V
Battery type: Li-ion Polymer (Grade A cells)
Compatible with: Xiaomi Mi 8 (M1803E1A, M1803E1T, M1803E1C), Xiaomi Mi 8 Explorer Edition, Xiaomi Mi 8 Pro, Xiaomi Mi 8 UD (Under-Display Fingerprint version)
Package include: 1 x battery
Revive your Xiaomi Mi 8 with this BM3E 3400mAh replacement battery. Released in May 2018, the Xiaomi Mi 8 was a flagship device featuring a 6.21-inch AMOLED display, Snapdragon 845 processor, and a 12MP+12MP dual-camera system. The 3400mAh battery combined with Qualcomm Quick Charge 4+ technology provided all-day endurance with fast top-ups. After 6-7 years of use, the original battery has likely degraded significantly. This Li-ion Polymer battery restores the full 3400mAh capacity, bringing back the reliable all-day performance the Mi 8 was known 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 All-Day Usage and Fast Charging: The 3400mAh battery provides solid endurance for daily tasks. With Quick Charge 4+ support, the battery can be charged to approximately 50% in just 30 minutes using a compatible charger. The Xiaomi Mi 8 also supports 18W fast charging, delivering a full charge in about 90 minutes. This replacement battery is fully compatible with all original charging capabilities.
When to Consider Replacement: After years of use, lithium-ion batteries naturally lose capacity. Common indicators include: the device requiring multiple charges per day, unexpected shutdowns at 15-25% battery level, noticeably slower charging than when new, or visible battery swelling. This replacement restores the original capacity and charging performance, extending the useful life of the device.
Compatibility Note: Fits Xiaomi Mi 8 (M1803E1A, M1803E1T, M1803E1C), Xiaomi Mi 8 Explorer Edition, Xiaomi Mi 8 Pro, and Xiaomi Mi 8 UD. Please confirm your battery model before ordering — BM3E is printed on your original battery. This battery is NOT compatible with Xiaomi Mi 8 SE, Xiaomi Mi 8 Lite, Xiaomi Mi 9 series, Redmi K20 series, or other Xiaomi models.

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Frequently Asked Questions

The BM3E battery for Xiaomi Mi 8 is compatible with Xiaomi Mi 8 (models M1803E1A, M1803E1T, M1803E1C), Xiaomi Mi 8 Explorer Edition, Xiaomi Mi 8 Pro, and Xiaomi Mi 8 UD (Under-Display Fingerprint version). If you need a Xiaomi Mi 8 battery replacement for M1803E1A or M1803E1T, this BM3E 3400mAh battery is the exact match. The Xiaomi Mi 8 features a 6.21-inch AMOLED display, Snapdragon 845 processor, and 12MP+12MP dual-camera system. For BM3E battery for Xiaomi Mi 8 compatibility, please verify your device model in Settings > About Phone. This battery is NOT compatible with Xiaomi Mi 8 SE, Xiaomi Mi 8 Lite, Xiaomi Mi 9 series, Redmi K20 series, or other Xiaomi models. If your Xiaomi Mi 8 battery drains quickly or won't hold a charge, this BM3E replacement battery will restore full performance.

The BM3E 3400mAh battery for Xiaomi Mi 8 has a typical capacity of 3400mAh (13.09Wh) and a rated voltage of 3.85V, with a charge limit of 4.4V. This BM3E 3.85V 3400mAh Li-ion Polymer battery is built with grade A cells and is CE, RoHS, and UN38.3 certified. For Xiaomi Mi 8 battery life after replacement, expect approximately a full day of moderate to heavy use on a single charge. The Xiaomi Mi 8 3400mAh battery performance provides solid endurance for daily tasks, gaming, and media consumption. Charging the Xiaomi Mi 8 battery with a Quick Charge 4+ compatible adapter takes approximately 30 minutes to 50% and 90 minutes to full. The battery also supports standard 18W fast charging. For best performance, allow 2-3 full charge cycles after installation to calibrate the battery meter. If your original battery now requires daily multiple charges or shuts down at 15-25% remaining, this replacement will restore the original battery life.

Professional Xiaomi Mi 8 battery installation is recommended. The Xiaomi Mi 8 has a sealed glass back with strong adhesive. To replace Xiaomi Mi 8 battery M1803E1A, the technician must heat the back cover to soften adhesive, carefully pry it open to avoid cracking the glass, disconnect the battery's small 2-pin connector, remove the old battery (lightly adhered), and install the new BM3E battery before resealing. The 6.21-inch AMOLED display is fragile, and improper prying can damage it. Third-party repair shops typically charge $20-35 for labor. Xiaomi official battery replacement costs vary by region. For Xiaomi Mi 8 battery health maintenance: 1) Use only a compatible Quick Charge 4+ or 18W fast charger for optimal charging. 2) Keep battery level between 20% and 80% for daily use to maximize lifespan. 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 Xiaomi Mi 8 battery care tips, stop using immediately if the battery shows any swelling.

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