Battery for Xiaomi Redmi Note 4: how to choose, replace and extend the service life

Xiaomi Redmi Note 4 remains one of the most popular smartphones of the brand even years after its release. Its reliability and performance have been appreciated by millions of users, but over time even the best equipment requires maintenance. The main “weak” element of any smartphone is the battery. If your Redmi Note 4 began to quickly discharge, turn off in the cold or balloon, it’s time to deal with the battery.

In this article, we will take a closer look at everything about the Xiaomi Redmi Note 4 battery, from the official specs to step-by-step replacement instructions, how to distinguish the original battery from a fake, what analogues to consider, and how to properly operate a smartphone to make the battery last longer, and also analyze the typical errors that shorten the battery life by 2-3 times.

Let me warn you right away, if you've never taken a smartphone apart, you'd better leave it to the professionals to replace it, but if you're willing to take a chance, our guide will help you do it neatly and without any consequences for your phone.

Official battery characteristics Xiaomi Redmi Note 4

The Xiaomi Redmi Note 4 was equipped with a 4,100 mAh lithium polymer battery (nominal value). The real capacity of the new battery is about 4,000-4,050 mAh, a normal discrepancy associated with production tolerances. Battery voltage is 3.85 V, which is typical for most Xiaomi smartphones of the period.

The original battery is labeled BM47 (for the Snapdragon 625) or BD41 (for the MediaTek Helio X20 version), which can be seen on the battery sticker. Importantly, the battery models for the different Redmi Note 4 versions are not interchangeable - Attempt to use a from battery a Snapdragon version in a MediaTek phone may lead to malfunctions or even damage.

The average lifetime of the original battery, when properly operated, is 2-3 years (or 500-800 charge cycles), after which the capacity drops to 60-70% of the original, resulting in a marked reduction in battery life. If your smartphone holds a charge of less than 4-5 hours in moderate use, the battery definitely needs to be replaced.

How to check battery wear on Redmi Note 4

Before you run for a new battery, make sure it's the one that's the problem. Here are 3 reliable ways to diagnose:

• 🔋 Built-in statistics MIUI: Go to Settings. → Battery → Battery status. This shows the current capacity as a percentage of the original capacity. If it's below 80 percent, it's time to change the battery.
• 📊 AccuBattery (free on Google Play): Shows real capacity, battery temperature and wear rate.
• 🔧 Visual inspection: if the smartphone case is swollen, the screen is "stepping away" from the frame, or the battery is "bubbling" is a critical signal for immediate replacement!

Note that if your smartphone turns off at 20 to 30 percent charge, it's not always the battery's fault. Sometimes the problem is with the power controller or the firmware. Before you change the battery, try resetting to factory settings (Settings → Additional → Recovery and Reset).

⚠️ Warning: if the battery is swelling, don't try to puncture or bend it! Lithium polymer batteries can ignite if damaged. Take the smartphone to the service or carefully remove the battery with gloves without deforming it.

Previous articleThe original vs analogues: which battery to choose for the Redmi Note 4

There are three types of batteries available on the market for the Redmi Note 4:

1. Original (from Xiaomi or authorized manufacturers, such as Desay) are more expensive, but guarantee compatibility and safety, and the marking must match the native battery (BM47 or BD41).
2. Quality analogues (Baseus, Remax, Patona brands) often have a capacity of 4200-4500 mAh, but real tests show that their resource is 10-15% lower than the original.
3. No-name fakes (unmarked, sold for 300-500 rubles) Risky option: they can swell in a month or do not match the declared capacity.

We recommend that you follow the following rule:

• 🔄 If the smartphone is used intensively (games, video shooting, navigation) - take the original or proven analogue with a capacity of not more than 4300 mAh.
• 💰 If you have a budget, choose a 12-month warranty and check (e.g. Baseus Power Bank Battery).
• ⚠️ Avoid batteries with a capacity of 5000 mAh or higher – they are either fake or overheat when charging.

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Check the reviews on AliExpress or Yandex Market before buying. Often, fakes with a Xiaomi sticker are sold under the guise of original batteries. Pay attention to the weight: the original battery weighs ~45-50 grams, and fakes less than 40 g.

Step-by-step instructions for replacing the battery

Replacing the battery in the Redmi Note 4 requires care and a minimal set of tools.

• 🔧 Plastic mediator or guitar mediator (for disassembly of the body)
• 🔨 Cross screwdriver (size) PH00)
• 🧲 Screen suction cup (optional, but simplifies the task)
• 🔥 Fryer (for softening glue)
• 🧴 Isopropyl alcohol (to clean glue residues)

If you've never taken a smartphone apart, practice on an old device or watch a video manual, and the rule of thumb is, take your time and don't put too much effort into it, because plastic latches are easy to break.

Turn off your smartphone and remove it. SIM-map|Heat the back cover with a dryer (1–2 minutes at medium power)|Put the mediator on the edge of the lid at the headphone jack.|Carefully drive the mediator around the perimeter, separating the latches|Unscrew 10 screws on an internal board (save them in a separate container)-->

After the lid is removed:

1. Disconnect the battery plume (it is fixed by the connector - put it under a plastic blade).
2. Put a plastic card on the battery, starting at the top edge. Don't use metal tools, you're at risk of puncturing the battery!
3. If the battery is glued, moisten the glue with isopropyl alcohol and wait 2-3 minutes.
4. Install a new battery, plug in the plume and assemble the phone in reverse order.

⚠️ Warning: After the battery is replaced, the smartphone may not turn on — that's OK. Connect it to charging for 10-15 minutes so that the power controller "sees" the new battery. If the charging indicator is not on, check the connection of the plume.

How to extend the life of the battery: 7 proven tips

Even a new battery will last longer if you follow the simple rules of operation. Here's what really works for the Redmi Note 4:

• 🔌 Charge correctly: avoid full discharge (plug charging at 15-20%) and don't keep your phone charging for more than 8-10 hours. Optimal range is 20-80%.
• ☀️ Avoid overheating: don't leave your smartphone in the sun or near heat sources.Temperatures above 40°C destroys lithium polymer elements.
• 📵 Disable unnecessary functions: GPS, NFC, Bluetooth and background synchronization of applications eat up to 30% of the charge.
• 🌙 Use a dark topic: AMOLED-The Redmi Note 4 is equipped with this black background reduces power consumption by 10-15%.

Another effective trick is calibrating the battery, so if your smartphone suddenly turns off at 30 to 40 percent charge, follow these steps:

1. Charge your phone to 100% and keep charging for another 1 hour.
2. Turn off charging and use your smartphone until you automatically turn off.
3. Connect the charger and repeat the cycle 2-3 times, this will reset the data of the power controller.

If you use the Redmi Note 4 as your second phone and it often lies idle, store it with a charge of 40-50% in a cool place. A fully discharged or 100% charged battery degrades 2-3 times faster.

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The most common reason for rapid battery wear is the use of non-original chargers. Cheap power supplies with AliExpress often give off unstable voltage, which destroys the battery in 6-12 months.

Common errors in battery replacement and operation

Many users are reducing battery life without even knowing it. Here are the 5 most common mistakes:

• 🔋 Using "fast" charging from other brands.Redmi Note 4 supports Quick Charge 3.0, but not all chargers are compatible.For example, units from Samsung or OnePlus can deliver too high voltage.
• 🧊 Operation in the cold, below -10.°The battery capacity drops by 50%, and when returned to heat, the condensate can cause corrosion of contacts.
• 🔄 Frequently charging to full. Lithium polymer batteries don't like to keep 100% charge. It's better to charge your phone more often, but not to maximize.
• 🛠️ Self-repair without tools, and trying to open the case with a knife or a screwdriver almost always ends in chipping on the frame or damage to the plumes.
• 📱 Ignoring updates MIUI. Newer versions of firmware often optimize power consumption. MIUI 12 added Ultra Battery Saver mode, which extends the work by 20-30%.

A separate point is to store your smartphone, and if you plan to not use the Redmi Note 4 for a few months, remove the battery and store it separately when charged 40-60% in a dry place, which will prevent the battery from becoming irreversibly damaged below the critical level (2.7V).

⚠️ Warning: If after replacing the battery, the smartphone becomes overheated, immediately disconnect it from charging! This may indicate a short circuit due to improper connection of the plume or defective battery.

Where to buy a battery for Redmi Note 4: proven sources

When buying a battery, the main thing is to avoid counterfeiting.

• 🛒 Official Xiaomi stores (e.g. Mi Store or authorized resellers) are guaranteed original, but the price will be higher than the market.

Average battery prices for Redmi Note 4 in 2026:

When buying, pay attention to:

• 📦 Packaging: Xiaomi’s original batteries are sold in a white box with a hologram and a sleek look. QR-code.
• 🏷️ Marking: the label must show the model (BM47/BD41), capacity and production date.
• 🔋 Appearance: Counterfeiting often has uneven edges, dull text on the sticker, or lack of protective film.

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Before you pay, ask the seller to make a video of the battery test in AccuBattery. The honest sellers will not refuse. If they refuse, this is a reason to be wary.

FAQ: Frequent questions about the Xiaomi Redmi Note battery 4