What battery is in Xiaomi Redmi Note 4: specifications and tips for replacement

Xiaomi Redmi Note Smartphone 4 (The codename mido remains one of the brand’s most popular budget devices even years after its release, and its reliability and performance have been appreciated by millions of users, but over time even the best battery pack loses capacity. If your device began to discharge in a few hours, turn off when 20-30% charging or overheating while charging - the problem most likely lies in the battery.

In this article, we will take a look at which battery is installed in the Redmi Note 4 factory, how to check its current condition, what analogues are suitable for replacement and what to look for when buying a new battery, and you will find step-by-step instructions for self-replacement (if you decide to do so), and answers to frequent questions about extending the life of the battery.

Official battery characteristics Xiaomi Redmi Note 4

From the factory Xiaomi Redmi Note 4 is equipped with a lithium-polymer (Li-Po) battery with the following parameters:

• 🔋 Capacity: 4100 mAh (milliamp-hours) is one of the key advantages of the model, providing up to 2 days of operation with moderate use.
• ⚡ Nominal voltage: 3.85V (typical for most Xiaomi smartphones).
• 📏 Size: approximately 150 × 70 × 4 mm (exact dimensions may vary slightly from manufacturer to manufacturer).
• 🔌 Type of connector: standard JST 1.0 (2 power contacts, 1 for thermistor).
• 🔄 Number of charging cycles: ~500 full cycles to a noticeable decrease in capacity (by Xiaomi standards).

It is important to understand that the actual capacity of the battery may differ from the stated capacity of the battery. 5-10% It's a matter of manufacturing and calibration, like testing a fresh Redmi Note. 4 Users often keep their capacity within the 4000–4150 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.

The battery in this model is non-removable, it's glued to the back cover with double-sided tape, and the connector is connected to the motherboard, which makes it harder to replace, but makes the structure more compact and moisture-proof.

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If your smartphone suddenly turns off 15-30% It's a sure sign of battery wear. Don't wait for it to start turning off when it's gone. 50% — Replace the battery in advance!

How to check the battery status in Redmi Note 4

Before you buy a new battery, make sure it's the problem. Here are some ways to diagnose:

1. Built-in statistics MIUI: Go to Settings. → Battery and productivity → Battery status. This shows current capacity in mAh and wear rate. If it's below 3,500 mAh, it's time to change the battery.
2. Engineering menu codes: Enter the combination ##4636## in the Phone app, then select Battery Information. Pay attention to the level (current charge in %) and health (state). Health: good means the battery is normal.
3. Third-party apps: Install AccuBattery (available on Google Play) that will show real capacity, battery temperature and discharge rate. If the capacity has dropped below 70% of the original, replace the battery.

Also, pay attention to the physical signs of malfunction:

• 🔥 Battery swelled (back cover raised or body deformed).
• 🌡️ The smartphone is very warm even with a simple charge.
• ⚡ Charging is jerked or interrupted (for example, shows "Charging is suspended").

What batteries are suitable for replacement: original vs analogues

If the diagnostics confirm battery wear, it's time to choose a replacement. You have two options: the original Xiaomi battery or a quality counterpart from third-party manufacturers. Consider the pros and cons of each.

If you choose an analogue, pay attention to the following points:

• 📋 Marking: Must match the original — BM47 or HB4165L4ECW (4100 mAh version).
• 🔌 Type of connector: only JST 1.0 (3 pins). Some cheap analogues come with JST 1.25 that won't fit!
• 🔍 Reviews: check on AliExpress or Yandex.Market real photos and video reviews of the battery.

Step-by-step instructions for replacing the battery in Redmi Note 4

Replacing the battery in the Redmi Note 4 requires care and minimal electronics skills. If you've never disassembled a smartphone, you'd better go to a service center, but you can do it yourself if you want, following our instructions.

Prepare tools: Plastic mediators (2-3 pcs.)|Cross screwdriver (PH00)|Fryer-dryer|Tweezers|New battery

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Step 1. Turn off your smartphone and remove the back cover.

• Turn off the device and remove the tray for SIM-map.
• Heat the back cover around the perimeter (temperature) with a hair dryer. ~60–70°C) for 2-3 minutes to soften the glue.
• Insert a plastic mediator into the gap between the lid and the case (start at the bottom corner) and gently tuck it in.

Step 2. Disconnect the battery plume.

• After removing the lid, you will see the battery glued to the body.
• Unscrew 4 screws that hold the metal plate over the battery connector (they are of different lengths - remember the location!).
• Carefully tuck the connector with tweezers and disconnect it from the motherboard.

Step 3. Remove the old battery.

• Pick up the battery with a plastic spatula and pull it up. If it doesn't lend itself, warm up again with a hair dryer (don't overheat!).
• Remove the remnants of old glue from the case (you can use isopropyl alcohol).

Step 4. Install a new battery.

• Stick the new battery to double-sided tape (comes with most batteries).
• Connect the connector to the motherboard and fix the metal plate with screws.
• Set the back cover in place, press it and warm up with a hair dryer for better fixation.

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Don't turn on your smartphone immediately after you've replaced it! Let the glue grab for 10-15 minutes, then complete a full charge cycle (0-100%) to calibrate the new battery.

⚠️ Warning: Never use metal tools to swell the battery, it can short circuit! Also, don't bend the battery or press it even if it's swelling. Lithium polymer batteries can ignite if damaged.

Frequent Replacement Mistakes and How to Avoid Them

Even experienced users sometimes make mistakes that cause a smartphone to break or a new battery to fail quickly, and the most common ones are:

• 🔌 Improper connection: if you confuse polarity or don't fully insert the plug, the smartphone won't turn on. Always check the markings. + and on the battery and board.
• 🔥 Overheating when soldering: some "masters" try to solder the contacts of the battery with a soldering iron, which leads to damage to the charging controller. In the Redmi Note 4, soldering is not required - quite a tight contact in the connector.
• 📉 Use of poor-quality glue: cheap Scotch can fall off in a week, and the battery will hang around inside the case. 3M tesa.
• 🔋 First charge from "fast" charging: the new battery must pass 2–3 Full charge cycle from a standard adapter (5V/2(a) to allow the controller to calibrate the capacity correctly.

Another common problem is that the smartphone doesn't turn on after it's replaced, and the reasons may be:

• Inappropriate battery (for example, with a different voltage or connector).
• Damage to the display plume or motherboard during disassembly.
• Protection against non-original components worked (reset via Fastboot).

If the battery is discharged too quickly after replacement, check:

• 🔌 Quality of contact in the connector (sometimes helps to reconnect the plug).
• 📱 Energy saving settings in MIUI (Turn off background activity of unnecessary applications).
• 🔋 Real capacity of the new battery via AccuBattery (possibly sold a fake battery).

How to extend the life of the battery Redmi Note 4: tips for operation

Even after you replace your battery, the battery life depends on how you use your smartphone, and here are some proven recommendations to help you keep the capacity longer:

• 🔋 Avoid full discharge: Lithium polymer batteries do not like deep discharge. Try to recharge your phone at 15-20% and do not allow shutdowns due to lack of charge.
• ⚡ Use the “native” charger: adapter from Redmi Note 4 exit 5V/2A. Higher current (Quick Charge) charges accelerate battery wear.
• 🌡️ Watch the temperature: do not leave your phone in the sun or near heat sources. The optimal temperature for the battery is 10-35°C.
• 📵 Disable unnecessary functions: GPS, NFC, Bluetooth and background app updates reduce battery life.
• 🔄 Calibrate the battery once every 3 months: completely discharge the phone before turning off, then charge to 100% without interruptions.

You should also pay attention to the settings. MIUI, which affect the charge flow:

1. Go to Settings → Battery and Performance → Battery Mode and select Balanced (not Performance!).
2. Turn off Auto Brightness and set a comfortable level manually (usually 40-60% is enough).
3. In the section Features MIUI → Advanced settings → Battery enable charging optimization (limits charge to 80% to extend lifespan).

⚠️ Warning: If you use the Redmi Note 4 as a backup phone and keep it off, charge the battery to 50% and repeat the procedure every 3 months.Storage in a discharged or fully charged state accelerates the degradation of lithium polymer cells.

Where to buy a battery for Xiaomi Redmi Note 4: proven options

The choice of place of purchase depends on your budget and the waiting time.

When buying on AliExpress, pay attention to sellers with a rating above 98% and orders over 1000.

• Xiaomi Mi Store Official (but not always original)
• DYS Battery Store (specialized in batteries).
• HYELE Official Store (Quality Analogues).

If you buy a battery from a local service, ask to see it before installing. Xiaomi's original battery has:

• Clear labeling with the brand logo.
• Factory packaging with a hologram.
• Temperature sensor (third contact on the connector).

FAQ: Frequent questions about the Xiaomi Redmi Note battery 4