Xiaomi Redmi Note 3 is the legendary smartphone Released in 2016, but still in demand due to the reliable “iron” stuffing and the ability to upgrade. However, even the most durable device eventually faces battery wear: capacity drops, the phone runs out in a couple of hours, and sometimes even turns off at 30-40% charge. If you notice these symptoms, it’s time to think about replacing the battery.
In this article, you will find step-by-step instructions for replacing the battery with the Redmi Note 3 (including the Pro and Prime versions), tips for choosing a quality battery, a list of necessary tools and unique disassembly nuances that are not written in standard manuals, we will also discuss how to avoid typical errors that lead to damage to the plumes or motherboard.
Signs that the battery Redmi Note 3 is time to change
The fall in autonomy is not always due to battery wear — sometimes background processes or faulty charging controllers are to blame. To accurately diagnose the problem, check for the following symptoms:
- 🔋 Phone's running out of power. 2-3 hours with moderate use (social networks, messengers, calls).
- 📉 The percentage of charge “jumps”: for example, from 40% immediately drops to 15% after a reboot.
- ⚡ The device is switched off when 20-30% although it had previously been used before 5-10%.
- 🔥 The battery swelled (see on the raised screen or body).
- 🛑 The phone does not turn on after full discharge, even when connected to charging.
If at least 2-3 items from the list match, the probability of battery wear is close to 100%. For final verification, you can use applications like AccuBattery (shown real capacity) or enter code ##4636## → Battery information into the engineering menu. If the level (charge level) does not correspond to the level displayed on the screen and health (state) below Good, the battery needs to be replaced.
⚠️ Attention: A bloated battery is dangerous! It can damage the screen, motherboard, or even ignite. If the phone's case is deformed, don't try to disassemble it yourself - contact the service center.
What battery to choose for Redmi Note 3: original vs analogues
The original battery for the Redmi Note 3 is marked BM43 (or BM44 for the Pro version) and a nominal capacity of 4050 mAh. However, after 5-6 years of operation, it is almost impossible to find a new original - the market is dominated by analogues.
| Criteria | Original (if you find it) | Quality analogue | Cheap analogue |
|---|---|---|---|
| Capacity | 4050 mAh | 4000-4200 mAh | 3,500 mAh |
| Tension. | 3.85 In | 3.8–3.85 In | 3.7 B or higher than 4.0 B |
| Marking | BM43/BT43 | It matches the original. | Absent or unreadable |
| Charge controller | Built-in | Built-in (e.g. Texas Instruments) | Absent or of low quality |
| Price (2026) | 2500–3500 ₽ | 1200–2000 ₽ | 500–900 ₽ |
Recommended brands are: ZMI (a sub-brand of Xiaomi), Baseus, Remax. Avoid unlabeled batteries with typos in the model name or suspiciously low price. Pay attention to the date of production - the battery over 1 year loses up to 10% of capacity even in the package.
Preparing for replacement: security tools and measures
To replace the battery with Redmi Note 3, you will need:
- 🔧 Plastic blades (or mediators) for disengaging the body.
- 🔨 Cross screwdriver (size) PH00 or PH0).
- 🔥 Hair dryer or thermo-air station for softening glue.
- 🧲 Magnetic mat or screw tray.
- 🩹 Alcohol and cotton swabs to clean contacts.
- 🔋 New battery with double-sided tape.
Important: Don't use metal tools to smear the case, they'll damage the plastic latches. Also, prepare the workplace: the desk should be clean, without crumbs and dust, and your hands should be dry. If you've never taken your smartphones apart, practice on an unnecessary device or watch a video disassembly of a particular model, the Redmi Note 3 has fragile plumes that are easy to tear.
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Before disassembly, completely discharge the phone (before automatic shutdown) - this minimizes the risk of short circuit in case of accidental contact with the board.
Step-by-step: how to disassemble the Redmi Note 3 and replace the battery
The battery replacement process takes 30-60 minutes. Follow the instructions in strict order:
- Turn off the phone and remove it. SIM-memory-card.
- Heat the back cover with a hair dryer (60–70°C) for 2-3 minutes to soften the glue. Keep the hair dryer 10 cm away so as not to melt the plastic.
- Put a plastic blade on the lid, starting at the bottom edge (near the charging connector), and carefully drive the blade around the perimeter, snapping the clamps.
- Unscrew 12 screws with a cross screwdriver (they are of different sizes - remember the location!) The screws next to the camera and antenna contacts are shorter than the others.
- Disconnect the plumes: Battery plume (black connector next to the battery), display plume (under the metal plate), power and volume button plume (at the top of the board).
Remove the old battery
Install a new battery
Collect the phone in reverse order.
☑️ Pre-assembly check
After assembly, turn on the phone and check:
- Charging is stable (the indicator flashes green).
- The phone doesn't overheat.
- Battery capacity in Settings → Battery is displayed correctly.
⚠️ Warning: If the phone doesn't turn on after replacing, check: Correct connection of the battery plume (sometimes it "steps away" when assembly); Integrity of contacts on the board (possibly you damaged them with a blade); battery polarity (plus / minus should match the marking on the case).
Calibration of the new battery: why it is important
The new battery requires calibration to allow the charge controller to correctly determine its capacity, without which the phone can either show the wrong percentage of charge or quickly discharge.
- Completely discharge the phone before automatically shutting down.
- Charge up to 100% without interruptions (use the original Xiaomi 5V/2A adapter).
- Turn off charging and let the phone work 1-2 hours in active mode (games, video).
- Repeat the discharge/charging cycles 2-3 times.
After calibration, check the actual capacity in the AccuBattery app. If it is below 3800 mAh, you may have purchased a fake battery or damaged the charge controller during disassembly.
What if the container does not match the declared?
Frequent battery replacement errors and how to avoid them
Even experienced craftsmen sometimes make mistakes that lead to the breakdown of the Redmi Note 3.
- 🔧 Display plume damage when the lid is sliding. Solution: Use only plastic blades and don't put any effort into it.
- 🔥 The solution is to heat the lid, not the motherboard.
- 🔋 Installation of the battery with the wrong polarity. Solution: check the labeling «+» and «−» case.
- 🛠️ Losing the screws or putting them in the wrong place. Solution: put the screws in order on the magnetic mat.
- 📱 Dust gets under the screen when you build it. Solution: work in a clean room and wipe the parts with alcohol.
After the replacement, the phone stopped seeing SIM-If you're not using a card or a camera, you probably forgot to plug in the antenna plume or the camera plume.
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The most common failure when you replace yourself is a break in the display plume. If the screen stopped working after assembly, do not try to repair it: the cost of replacing the plume is comparable to the price of a used phone.
Cost of battery replacement: self vs service center
The cost of replacing the battery depends on the method of repair and the region, and here are the approximate rates for 2026:
| Replacement | Cost (₽) | Pluses | Cons |
|---|---|---|---|
| Independently (analogue) | 1200–2000 | Savings, experience in repair | Risk of damaging the phone |
| Self-directed (original) | 2500–3500 | Maximum battery life | Hard to find the original. |
| Service centre (analogue) | 1800–2500 | 1-3 month warranty | Additional diagnostic costs |
| Service centre (original) | 3000–4500 | Professional assembly | High price. |
If you are not sure about your abilities, you should contact the service. This is especially true for the Redmi Note 3 Pro, where the plumes are thinner and the board is more sensitive to static electricity. In Moscow and St. Petersburg, replacement is performed in 1-2 hours, in the regions the period can increase to 1-2 days.