Xiaomi Redmi 3 is a legendary budget smartphone released in 2016, but still remains in service for many users. However, over time, even the most enduring technology fails: the battery bloats, quickly sits down or refuses to hold a charge for more than an hour. If your Redmi 3 has become “voracious” and requires recharging every 2-3 hours, it’s time to think about replacing the battery.
In this article, you will find detailed instructions on how to replace the battery with Xiaomi Redmi 3 (including the Pro and Prime modifications), tips on choosing a quality battery, a list of tools you need, and answers to frequent questions. We will analyze the process from A to Z - from preparing the workplace to first charging a new battery. And if you have never disassembled a smartphone, don't worry: Redmi 3 is one of the most maintainable models of Xiaomi.
Before you start, consider that self-replacing a battery is not warranty (if it's still valid) and requires care. But if you do it right, you'll save 1,500 to 3,000 rubles that you'd take at a service center. Ready? Then get started!
How to know if the battery on Redmi 3 should change: 5 clear signs
Take your phone apart at the first suspicion of battery wear, and it may be software settings or background energy consumption, but if you see at least 2-3 symptoms from the list below, the battery needs to be replaced.
- 🔋 Smartphone discharges by 30-50% per hour in standby mode (without active use).
- 🔥 The body of the phone swelled or deformed (especially noticeable in the area of the back cover).
- ⚡ The phone turns off at 20-30% charge, although the indicator shows the remaining energy.
- 🛑 Redmi 3 does not turn on after full discharge, even if connected to charging.
- 📉 Battery life has decreased by 2-3 times compared to the “youth” of the phone.
A bloated battery is especially dangerous, as it can damage the internal components of a smartphone or even ignite. If the phone body starts to "pull up", do not delay the replacement: lithium-ion batteries in this state pose a real threat.
⚠️ Warning: If the battery is so swelled that the Redmi 3 back cover doesn't close, don't try to press it down.
Before you change the battery, check the status of the charging port contacts and try resetting to factory settings (Settings → Additional → Recovery and Reset). Sometimes the problem lies in software failures, not in hardware.
Which battery to choose for Xiaomi Redmi 3: original vs analogues
The battery quality is not only the life of the phone, but also the safety of the phone, and cheap counterfeits can swell in a month or damage the power controller.
| Type of battery | Capacity | Cost (2026) | Pluses | Cons |
|---|---|---|---|---|
| Original (Xiaomi) | 4100 mAh | 1 800–2 500 ₽ | Compatibility guarantee, long service life | High price, difficult to find on sale |
| Licensed analogues (ZMI, Baseus) | 4000-4200 mAh | 1 200–1 800 ₽ | Good quality, more accessible than the original | They may not be a bit similar in size. |
| Budgetary analogues (no-name) | 3800-4,000 mAh | 600–1 000 ₽ | Low price | Risk of bloating, short service life |
For the Redmi 3, a battery labeled BM47 or BL-47Q (original article) is fine. Note the capacity: if the specs are higher than 4100 mAh, that's a hoax. Physically, the Redmi 3 can't fit a larger battery.
Where to buy it?
- 🛒 Xiaomi's official stores (if available).
- 🌍 Sites like AliExpress (look for sellers with a rating above 98% and reviews of durability).
- 🔧 Radio parts stores (for example, Chip and Deep»).
⚠️ Warning: Before buying, make sure that the battery has a protective film and marking with a production date. Batteries older than 1 year lose up to 20% of their capacity before installation!
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If you buy a battery on AliExpress, choose options with delivery from Russian warehouses - so you will receive the goods faster and can return it when you marry.
Redmi 3 battery replacement tools: what you need
To disassemble Xiaomi Redmi 3 does not need professional tools - enough basic set.
- 🔧 Plastic blades (2-3 pieces) for putting the cover and disconnecting the plumes.
- ⚒️ Cross screwdriver (size) PH00 or PH0) screw.
- 🔥 Dryer or thermo-air station (to soften the glue under the battery).
- 🧲 Magnetic mat or screw container (so as not to lose small details).
- 🩹 Tape or tape for fixing plumes.
- 🔋 New battery (read more about the choice above).
- 🧴 Alcohol or contact cleaner (to remove glue residues).
If you don't have a hair dryer, you can do with a plastic card and patience, but it takes longer. You can also use a mediator (a thin guitar record) or a special battery suction cup (sold in phone repair kits) to unplug the battery carefully.
Don't use metal tools to tamper with the battery -- they can puncture it or close the contacts -- the best option is a plastic blade with rounded edges.
Turn off the phone and remove it. SIM-map|Prepare a workplace with good lighting|Charge a new battery to 30-50% (unless it’s new)|Take a photo of the insides of the phone before disassembling|Turn off your phone from all cables.-->
Step-by-step: how to disassemble Redmi 3 and replace the battery
Now, to the most critical stage, follow the instructions in strict order so that you don't damage the plumes or the motherboard.
Step 1: Removing the back cover
The Redmi 3 has a non-removable back panel glued to the body to remove it:
- Turn off the phone and remove the tray for SIM-map.
- Heat the hair dryer of the edge of the cover (temperature ~60°C) for 1-2 minutes to soften the glue.
- Insert a plastic blade into the gap between the lid and the body (start at the bottom corner where the speaker is located).
- Carefully drive the shoulder blade around the perimeter, separating the lid. If it does not respond, warm up again.
Be careful, there are fingerprint scanner plumes and antennas under the lid. Don't pull the lid out so you don't tear them off!
Step 2: Battery disconnection
When you take the lid off, you'll see the battery glued to the body.
- Unscrew 6 screws that fix the metal plate over the battery (use the PH00 screwdriver).
- Disconnect the battery connector from the motherboard with a plastic spatula (not metal!).
- Pull the battery off the edge and pull it up gently, and if it doesn't move, warm it up with a hair dryer (not above 70°C!) and put a thin plastic plate under it.
Never use sharp objects to extract the battery – a puncture of a lithium-ion battery can cause a fire!
Step 3: Installation of a new battery
Before installing the new battery:
- Clean the contacts on the motherboard and battery connector with alcohol.
- Make sure that the new battery has a protective film (do not remove it before installation!).
- Stick the battery onto double-sided tape (comes with most batteries).
- Connect the battery connector to the motherboard and fix the metal plate with screws.
After assembly, do not turn on the phone immediately - let the glue grab for 10-15 minutes.
What to do if the battery does not disconnect?
Step 4: Reverse Assembly
Collect the phone in reverse order:
- Put the plumes in their places (orientate yourself by the photo that was taken before the dismantling).
- Stick the back cover to double-sided tape or a special glue (e.g. B-7000).
- So, turn the sleeves (do not pull them out!).
- Put it in. SIM-card and turn on the phone.
If the phone does not turn on after assembly, check:
- Is the battery connector properly connected?
- Are the contacts closed on the motherboard?
- Is the new battery charged (sometimes it takes 5-10 minutes to charge the phone to wake up)
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If the phone discharges quickly after replacing the battery, calibrate the battery: completely discharge it before turning it off, then charge it to 100% without interruptions. Repeat the procedure 2-3 times.
Frequent Battery Replacement Mistakes and How to Avoid Them
Even the skilled craftsmen sometimes make mistakes that cause the phone to break down. TOP-5 Failures and ways to prevent them:
- 🔌 Forgetting to turn off the battery connector before removing it. It can cause a short circuit! Always disconnect the battery from the motherboard first thing.
- 🔥 The battery is overheated with a hairdryer. The optimum temperature is 60-70.°C. Overheating over 80°C will damage the battery and may deform the body.
- 🔧 They're losing or confusing screws. Rotors in Redmi 3 are different lengths! Take a picture of their location or use a magnetic mat with cells.
- 📱 The plumes of the fingerprint scanner or the antennas are damaged, and these plumes are fragile, so don't pull them or rot. If you do, you'll have to change the entire module.
- 🔋 Put the battery in place without the protective film, the film prevents the contacts from closing, and don't remove it until the phone is fully assembled!
If after replacing the battery, the phone began to overheat or discharge quickly, most likely the problem is:
- A bad battery (return it to the seller).
- Poor contact of the battery connector (check if it is bent).
- Damage to the power controller (diagnosis is required in the service).
⚠️ Warning: If after replacing the battery, the phone only turns on from charging, but does not work on the battery, chances are you damaged the power controller on the motherboard.
How to extend the life of a new battery on Redmi 3: 7 rules
To make the new battery last longer, follow these guidelines:
- 🔌 Avoid full discharge. The optimal charge range is 20-80%. Full cycles "0-100%" shorten the life of the battery.
- ⚡ Use the original RAM. High-current charges (fast charging) accelerate battery wear. - For Redmi 3 load up 5V/2A.
- 🌡️ Don't overheat the phone. Temperatures are above 40.°C is harmful to lithium-ion batteries. Don't leave your phone in the sun or near heat sources.
- 📵 Disable unnecessary functions. GPS, Bluetooth, mobile data in the background consumes charge.
- 🔄 Calibrate the battery every 3 months. Completely discharge the phone, then charge to 100% without interruptions.
- 🚫 Do not use your phone while charging. Simultaneous charging and loading (games, videos) increase battery heat.
- 📴 Keep your phone at 40 to 50 percent charge. If you don't use your phone for long periods (like vacation time), discharge it to half and turn it off.
If you follow these rules, you can extend the life of the battery by 30-50%, and on average, a quality battery in Redmi 3 lasts 2-3 years if used correctly.
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Install the AccuBattery app (available on Google Play) that tracks battery status, shows real capacity, and helps optimize charging.
How much does it cost to replace the Redmi 3 battery in the service vs independently?
If you're not sure about your ability, you can go to the service center, but the price difference is significant.
| Replacement option | Cost (2026) | Pluses | Cons |
|---|---|---|---|
| Official Xiaomi service | 2 500–3 500 ₽ | 6-12 months warranty, original parts | Long (3-7 days), high price |
| Informal service | 1 200–2 000 ₽ | Fast (1-2 hours), cheaper | Risk of unoriginal parts, no guarantee |
| Self-sustaining replacement | 600–1 800 ₽ (battery) | Minimum costs, experience of repair | The risk of damage to the phone, no guarantee |
Self-replacement costs 3-5 times less, but requires care. If you’ve never disassembled your phones, practice on an unnecessary device or watch YouTube video instructions (such as from Repair Universe or iFixit channels).
The average battery replacement time in service is 1-2 hours, on your own - 30-60 minutes (if everything goes smoothly), the main advantage of self-repair is that you know exactly what battery is installed and how it was installed.