BM51 5500mAh 3.85V Li-ion Polymer Replacement Battery for Xiaomi Mi Max 3 M1804E4T M1804E4A M1804E4C Dual IC Protection

Description

Battery model: BM51
Capacity: 5500mAh (typical) / 5400mAh (rated)
Rated voltage: 3.85V (also compatible with 3.8V devices)
Charge limit voltage: 4.4V
Battery type: Li-ion Polymer
Features: Dual IC protection (overcharge, over-discharge, short circuit protection)
Compatible with: Xiaomi Mi Max 3 (M1804E4T, M1804E4A, M1804E4C)
Package include: 1 x battery
Restore the legendary battery life of your Xiaomi Mi Max 3 with this BM51 5500mAh replacement battery. Released in July 2018, the Mi Max 3 was Xiaomi’s battery-focused phablet featuring a massive 6.9-inch display and was designed for users who need exceptional screen-on time for streaming, browsing, and gaming. This Li-ion Polymer cell delivers the original 5500mAh capacity, and unlike many modern sealed phones, the Mi Max 3 features a removable plastic back cover — making battery replacement accessible for DIY users.
Technical Details for Mi Max 3 Owners: The BM51 5500mAh battery for Xiaomi Mi Max 3 maintains the original 4.4V charge termination voltage (3.85V nominal) and features dual IC protection — two independent protection circuit modules guard against overcharge, over-discharge, and short circuits for enhanced safety. This is a critical safety feature for a high-capacity 5500mAh cell. Unlike lower-quality alternatives, this Xiaomi Mi Max 3 battery replacement uses grade A cells with low internal resistance, ensuring stable power delivery for the Snapdragon 636 processor and 6.9-inch IPS display. CE, RoHS, and UN38.3 certified for safety.
DIY-Friendly Installation Guide (Removable Back Cover): The Xiaomi Mi Max 3 is one of the last battery-focused phones with a user-accessible design. However, the plastic back cover is delicate and can crack if pried incorrectly. Recommended steps: 1) Power off the device. 2) Use a plastic pry tool or guitar pick — never metal tools. 3) Gently work around the edge of the back cover starting from the bottom. The cover is held by plastic clips, not strong adhesive. 4) Once opened, remove the cover screws and disconnect the BM51 battery connector by pulling the plug (not the wires). 5) Remove the old battery (lightly adhered), install the new BM51 replacement battery, then reassemble. 6) If the device doesn’t power on after replacement, leave it connected to the original charger for 10-15 minutes to activate the protection circuit. For users uncomfortable with phone repairs, professional installation is recommended — repair shops typically charge $15-25 for labor.
Compatibility Note: Fits Xiaomi Mi Max 3 models M1804E4T (global), M1804E4A (India), and M1804E4C (China). Please confirm your original battery model before ordering — BM51 is printed on your existing battery. For reference, third-party retailers like Batteries America sell a compatible 5400mAh version for approximately $26 with a 1-year warranty, while bulk suppliers on Alibaba offer around $11.30. Our BM51 5500mAh battery replacement for Xiaomi Mi Max 3 offers competitive pricing with a 90-day warranty and direct support. If your Mi Max 3 shuts down unexpectedly when the battery indicator still shows charge, or if it drains too quickly during video streaming, this replacement will restore stable power delivery.
Battery Care for Mi Max 3: For maximum lifespan, keep battery level between 20% and 80% for daily use. New batteries require 2-3 full charge cycles to reach optimal capacity — after installation, charge the new battery fully before first use. Use the original Xiaomi charger that came with your device. If storing the device for more than 2 months, keep the battery at approximately 60% charge. Avoid leaving the Mi Max 3 in hot environments (e.g., inside a car in summer) — heat accelerates battery degradation. Stop using immediately if the battery shows any swelling. For optimal BM51 battery calibration for Xiaomi Mi Max 3, perform one full discharge-recharge cycle (drain until auto-shutoff, then charge uninterrupted to 100%) after installing a new battery.