Xiaomi Mi Note 3 is the flagship smartphone of 2017, which is still popular due to balanced performance and high-quality build. However, over the years, even the most reliable equipment requires maintenance, and most often the problems begin with the battery: quick discharge, sudden shutdowns, bloating. If your Mi Note 3 has become worse than before, it’s time to figure out which battery is installed in it, which analogues will be suitable for replacement and how to conduct the procedure.
In this article we will analyze in detail: the original battery parameters (capacity, voltage, dimensions), compatible analogues from proven manufacturers, step-by-step instructions for replacing with photos and videos, tips for extending the life of a new battery, common mistakes that are made during repairs.
We also answer frequent questions: can you use a larger battery, how to verify the authenticity of the original battery and what to do if the smartphone does not turn on after replacement.
Technical characteristics of the original battery Xiaomi Mi Note 3
Xiaomi Mi Note 3 comes with a non-removable lithium-polymer battery model BM48 (producer code).
- 🔋 Capacity: 3500 mAh (nominal), the real capacity after 2-3 years of operation often falls to 60-70% of the declared.
- ⚡ Voltage: 3.85 V (typical for Li-Pol batteries), operating range - 2.8-4.4 V.
- 📏 Sizes: 148.5 × 70.5 × 3.5 mm (length) × width × The deviation even by the 0.5 mm may cause problems with installation.
- 🔌 Connector: 3-pin (three contacts: plus, minus, thermistor for temperature control).
- 🏭 Manufacturer: Original batteries were produced ATL (Amperex Technology Limited and SDL (Sunwoda Electronic) commissioned by Xiaomi.
Important: There are fakes on the market for the original BM48 battery, which are visually indistinguishable, but have a lower real capacity (2500-3000 mAh) and fail faster. To avoid cheating, buy batteries only from trusted sellers with a warranty.
Compatible analogues: which batteries are suitable for the Mi Note 3
If the original BM48 battery is unavailable or too expensive, you can consider third-party quality models, but the key is to match the parameters of capacity, voltage and size.
| Manufacturer | Model | Capacity | Tension. | Features |
|---|---|---|---|---|
| Baseus | BAT-MN3-3500 | 3500 mAh | 3.85 In | High-quality Japanese chips, protection against overheating |
| Remax | RB-M35 | 3600 mAh | 3.85 In | Increased capacity, but may slightly protrude beyond the body |
| Patona | PAT-MN3 | 3500 mAh | 3.85 In | German brand certified to CE standard |
| ZMI (a subsidiary of Xiaomi) | ZB-MN3 | 3500 mAh | 3.85 In | Optimal price/quality ratio, full compatibility |
⚠️ Warning: Batteries with a capacity of more than 3600 mAh may not fit in the case of the Mi Note 3 or cause problems with calibration of the power controller. Also avoid batteries with voltages above 3.85 V - this can damage the motherboard.
Before buying, check the reviews for a specific model: some analogues may have problems with fast discharge in standby mode or incorrect display of the charge level in MIUI.
How to replace the battery in Xiaomi Mi Note 3: Step-by-step instructions
Replacing the battery in the Mi Note 3 requires accuracy and basic electronics skills. If you've never disassembled a smartphone, you'd better contact a service center.
- 🔧 Set of screwdrivers (cross, flat, torks) T3–T5).
- 🔥 Hair dryer or thermo-air station for softening glue.
- 📱 Plastic blades or mediators for separation of the body.
- 🧲 Screen removal suction cup (optional).
- ☠️ Gloves and protective glasses (glue and glass can hurt).
⚠️ Attention: If you remove the back cover in a careless manner, you can damage the fingerprint scanner plume (located at the top of the case) or antenna contacts. If the sensor stops working after the replacement or the network signal deteriorates, check the integrity of the plumes.
Turn off your smartphone and remove it. SIM-map|Discharge the battery to 20-30% (minimizes the risk of fire)|Prepare the workplace: clean surface, good lighting|Make a backup copy of the data (in case of an error)|Disconnect power from all tools (dryer, soldering iron)-->
Step-by-step process:
- Heat the body. Dryer warm the back cover around the perimeter (temperature ~60°C) for 2-3 minutes to soften the glue.
- Take the lid off. Carefully apply a plastic blade to the bottom edge of the case (on the side of the USB-C connector) and slowly separate the lid as you move around, and if resistance is strong, reheat the problem area.
- Disconnect the battery plume from the motherboard (use a plastic blade to avoid damaging the contacts).
- Remove the old battery. Tuck the battery in with a spatula or a special device to remove the adhesive batteries. Do not use metal tools - risk puncture!
- Install a new battery. Check the polarity (plus/minus should match), glue the new battery to double-sided tape or special glue, connect the plume.
- Make sure all the plumes are connected, put a back cover and lock it in with glue or tape.
After replacement, be sure to calibrate the battery: Settings → Battery → Three dots (menu) → Calibration of the battery.
If this item is missing, completely discharge the smartphone, then charge up to 100% without interruptions.
(1) Correct connection of the battery plume.
(2) Integrity of motherboard contacts (possible oxidation).
3) New battery compatibility (some analogues require power controller firmware).-->
Top.-5 Mistakes in Replacing the Battery and How to Avoid Them
Even experienced users sometimes make mistakes that cause a smartphone to fail, and here are the most common mistakes and ways to prevent them:
- Using metal tools to remove the battery. ❌ Consequences: battery puncture, short circuit, fire. ✅ Solution: Use only plastic or wooden blades.
- Hydrogen overheating. ❌ Consequences: Melting plastic elements, damaging the screen or motherboard. ✅ Solution: Keep the hair dryer at a distance of 10-15 cm, the temperature is not higher than 60°C.
- Incorrect connection of the battery plume. ❌ Consequences: Smartphone does not turn on, battery does not charge. ✅ Solution: Check the polarity (the plume has markings) + and –).
- Ignoring calibration after replacement. ❌ Consequences: Incorrect display of charge level (for example, jumps from 50% to 1%). ✅ Solution: Complete the full discharge/charging cycle or use Engineering Mode (#4636##).
- Buying Cheap Uncertified Batteries. ❌ Consequences: Rapid degradation, bloating, risk of fire. ✅ Solution: Buy batteries with certificates CE, RoHS or UL.
If the smartphone becomes very hot or discharges quickly after replacing, it is likely that the problem is a poor-quality battery or damage to the power controller.
How to extend the life of a new battery
Even the best battery pack loses capacity over time, but proper operation can slow this down significantly. Here are the key recommendations for the Xiaomi Mi Note 3:
- 🔌 Charging: Use an original or certified RAM (5V/2A or 9V/2A). Quick Charge reduces battery life by 10–15%.
- 🌡️ Temperature: Avoid overheating (above 35)°C) and hypothermia (below 0)°C. Do not leave your smartphone in the sun or near heating appliances.
- 📴 Charge level: Optimal range 20-80%, constant charging up to 100% accelerates degradation.
- 🔄 Cycles: Try not to let the full discharge (0%) Lithium polymer batteries "don't like" deep discharges.
- 🛠️ Updates: Update regularly MIUI — In new versions, energy consumption is optimized.
⚠️ Warning: If you notice that the battery is swollen (the case cover is raised, the screen is "going away"), immediately turn off the smartphone and do not use it until the battery is replaced.
What to do if the battery is swelling?
To monitor the battery status, use applications like AccuBattery (showing real capacity, temperature and wear) or built-in statistics in MIUI: Settings → Battery → Battery condition.
Frequent questions about battery replacement in Mi Note 3
Can I put a battery with a larger capacity, for example, 4000 mAh?
How to check if the original battery is installed in the smartphone?
The smartphone doesn't turn on after the battery is replaced.
How much does it cost to replace a battery in a service center?
Can I replace the battery without disassembling the body?
💡
If you are not sure of your skills, trust the replacement battery professionals. Poor repair can damage the motherboard, screen or other components, and its cost will be many times higher than the savings on service.