Xiaomi Redmi 3 Pro
70% capacity
safely and at minimal cost
Many are afraid to disassemble the smartphone on their own, for fear of damaging the plumes or display. 3 The Pro is one of Xiaomi’s most maintainable models, thanks to its removable back cover and modular design, and with the right approach, replacing the battery will take no more than a few days. 30 The cost of the new battery in 3-5 It's less than a master's service, and the key is to follow the instructions and not rush.
⚠️ Warning: If the battery is swelled or deformed, do not attempt to puncture or bend it! this can lead to fire or explosion. In this case, immediately remove the battery (do not turn on the phone!) and dispose of it at special reception points.
How to know if the battery is time to change: 5 key signs
Before you start the screwdriver, make sure the battery is the problem. Here are the typical symptoms of a dying battery on the Xiaomi Redmi 3 Pro:
- 🔋 The phone's running out of power. 1-2 hours with moderate use (social networks, messengers).
- 📉 The percentage of charge "jumps" (for example, from 50% immediately drops to 15%).
- 🔌 The machine is off when 20-30% charge and not activated without recharging.
- 🌡️ The case of the smartphone became hot in the battery area (a sign of increased internal resistance).
- 📱 The back cover or screen swelled (the gap between the case and the glass is visible).
If any of these signs show up, check the battery status through an engineering menu or apps like AccuBattery (available on Google Play ##4636##, Select Battery Information and see Wear Level. 200-250 (orpercentage > 40%) It is time to change the battery.
You can also evaluate the capacity with the help of USB-Tester (e.g. Xiaomi) ZMI If the real capacity is less than 2000 mAh when fully charged (the Redmi 3 Pro originally had a 4100 mAh battery), the battery is critically worn out.
2. Which battery to choose for Xiaomi Redmi 3 Pro: original vs analogues
Original battery for Redmi 3 Pro has articular MB11 And it's 4,100 mAh, but Xiaomi hasn't made these batteries for a long time, so they're on the market:
- 🔄 Original used (from disassembly) - cheap, but risky (may be wear and tear).
- 🏭 Analogues from proven brands (Baseus, Remax, Patona) are more reliable than no-name.
- 🔋 Increased batteries (up to 5000 mAh) - require modification of the case, not recommended for beginners.
The best option is a new counterpart with a warranty from a well-known manufacturer.
- 📋 Capacity - at least 4000 mAh (otherwise there is no sense in replacing).
- 🔌 The tension must be 3.85V (original).
- 🛡️ Protection – the presence of a controller from overheating / overcharging.
- 📦 Set – in the set should be adhesive strips for fixation.
| Manufacturer | Model | Capacity | Price (2026) | Pluses | Cons |
|---|---|---|---|---|---|
| Baseus | BAT-R3P-41 | 4100 mAh | ~1200 ₽ | Good controller, long service life | Sometimes you get fakes. |
| Remax | RMB-410 | 4200 mAh | ~1100 ₽ | A little more capacity than the original | 0.5 mm thicker (may not fit into the body) |
| Patona | PAT-R3PRO | 4000 mAh | ~900 ₽ | Low price, easy installation | Capacity below the original |
Buy batteries only in trusted stores (AliExpress with a seller rating) >98%, Beru, Svyaznoy.avoid unmarked or suspiciously low-priced options (less than 800) ₽) — These are most often re-labeled used batteries.
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Before buying, check the battery reviews by photo - often sellers lay out capacity tests using the help of the battery. USB-tester.
3. Replacement tools: what you need and where to buy
To replace the battery with Xiaomi Redmi 3 Pro, you will need a minimum set of tools:
- 🔧 Plastic mediator or spatula (to open the lid).
- ⚡ Thin screwdriver cross (PH00) screw.
- 🧲 Magnetic mat or tray (so as not to lose screws).
- 🔥 Hair dryer or thermo-air station (if the glue is too strong).
- 🧴 Isopropyl alcohol (90%+) clean-up.
- 📦 New battery with adhesive strips.
The entire set can be purchased on AliExpress for 300-500 ₽ (If you don't want to wait for delivery, similar tools are sold in radio stores (Chip and Deep, 220 volt).
⚠️ Warning: Do not use metal blades or knives to open the case! They can damage the plumes or leave scratches on the plastic. 0.2-0.3 mm.
If you’re taking your handset apart for the first time, we recommend watching the Redmi 3 Pro disassembly video guide (like on the Repair Universe or Fixez channel).
- 🔧 Rotating screws (can break threads).
- 🔌 Damage to the display plume (it goes under the battery!).
- 🔥 Overheating of the body with a hairdryer (sufficient) 60-70°C).
Buy a new battery with adhesive strips|
Prepare the workplace (clean table, good lighting)|
Backup of data (in case of error)|
Charge your phone at least 30% (so as not to lose data during disassembly)|
Turn off the phone before starting work-->
4. Step-by-step instructions: how to disassemble Xiaomi Redmi 3 Pro and replace the battery
Now, to the process itself, follow the instructions in strict order to avoid damaging your smartphone.
Step 1: Turn off and prepare the phone
Turn off Redmi 3 Pro, retrieve SIM-card and memory card (if installed) Place the phone on a flat surface with the screen down.
Step 2: Removal of the back cover
The back cover of the Redmi 3 Pro is mounted on latches and double-sided tape to remove it.
- Heat the edge of the body with a hair dryer (30-40 seconds) to soften the glue.
- Insert a plastic mediator into the gap between the lid and the case (start at the bottom corner where the charging connector is).
- Carefully drive the mediator around the perimeter, snapping the latches. Do not force - if the lid does not respond, warm up again with a hairdryer.
When you take the lid off, you'll see the battery covered in black film. Don't pull the plumes, they're fragile!
Step 3: Shutting off the battery
Before you remove the battery, be sure to disconnect it from the charge:
- Unscrew 2 screws fixing the metal plate above the battery plume (they are marked with red circles in the photo below).
- Carefully dent the plume with a plastic spatula and disconnect it from the connector.
⚠️ Note: If you skip this step and try to remove the battery without disconnecting it from the board, it can lead to short circuit and motherboard failure!
Step 4: Remove the old battery
The battery in the Redmi 3 Pro is glued to the body to remove it.
- Put the battery on the side with a plastic shovel (where there are no plumes!).
- If the glue is too strong, drop a little isopropyl alcohol under the battery - it will dissolve the glue behind the battery. 1-2 minute.
- Carefully pull the battery up without bending it. If it swells, use gloves.
After extraction, inspect the case for glue residues, remove them with alcohol or scraper.
Step 5: Installation of a new battery
Before installing the new battery:
- Make sure that there is no dust or oxidation on the contacts (wipe with alcohol).
- Remove the protective film from the adhesive strips on the new battery.
- Carefully insert the battery into the case, press it to fix.
- Connect the plume to the connector on the board and fix the metal plate with screws.
Step 6: Build the phone
Make sure all the plumes are connected, then:
- Install the back cover in place, starting at the top (where the camera is).
- Press the lid around the perimeter so that the latches fall into place.
- Turn on your phone and check the charge (should be) 0-10%).
If the phone is not turned on, check:
- 🔌 Connecting the battery plume (it may not be fully inserted).
- 🔋 The polarity of the battery (plus / minus must coincide with the connector).
- 🔧 Tightening of screws (uncut screws can cause short circuits).
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If the phone is not charging after replacement, check integrity USB-stainless, and when it is unspoiled, it is easy to damage.
5. Calibration of the new battery: why it matters
After the battery is replaced, it needs to be calibrated so that the charge controller correctly determines the level of charge, otherwise the phone can show 100%, and after 10 minutes suddenly turn off.
Calibration instructions:
- Completely discharge the phone before automatically shutting down.
- Connect to charging and do not turn on during 8-12 hours (even if the indicator shows the 100%).
- Turn off the charger, turn on the phone and wait for a full discharge.
- Repeat the charging-discharge cycle 2-3 times.
You can also use the Battery Calibration app (available on Google Play), but manual calibration is more reliable.
After calibration, check the actual capacity through AccuBattery or the engineering menu, and if it is less than 3,500 mAh, it may be defective or poorly glued.
What if the phone is quickly discharged after calibration?
6.Typical battery replacement errors and how to avoid them
Even with a careful replacement, you can make mistakes that will cause your phone to break down.
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of metal tools | Scratches on the body, damage to plumes | Use only plastic mediators |
| Hydrogen overheating | Deformation of plastic, detachment of plumes | Heat no more than 70.°C, keep the hair dryer at 10 cm distance |
| Disconnection of the display plume | White stripes or no image on the screen | Don't pull on the plumes, fix them with scotch |
| Installation of a battery with a different capacity | Fast discharge, overheating. | Check the marking (should be 4100 mAh, 3.85V) |
Another common problem is that the phone doesn't turn on after assembly, and there are many reasons.
- 🔌 Unconnected battery plume (check connector).
- 🔋 Faulty new battery (measure voltage with a multimeter - should be 3.7-4.2V).
- 🔧 Short circuit (if screws are twisted or dust hits the board).
If the phone doesn’t respond to the on button, try:
- Connect to charging for 30 minutes (possibly the battery is discharged to zero).
- Hold the power button. + Volume up on 10-15 seconds (emergency reset).
- If it doesn’t help, take the phone apart and check the connection of all the plumes.
7. Recycling of an old battery: where to take and why it is important
Lithium-ion batteries can't be thrown into the trash, they contain toxic substances (cobalt, lithium, electrolyte) that pollute soil and water, and a damaged battery can ignite.
Where to take the old battery from Xiaomi Redmi 3 Pro:
- 🏬 Electronics reception points (in the shops of the Svyaznoy, M. Video, Eldorado there are special urns).
- 🔄 Service centers (many workshops accept batteries for free).
- ♻️ Eco-points (you can find the nearest one on the Recyclemap website).
In some cities, for the delivery of batteries give bonuses or discounts (for example, in the Svyaznoy you can get points for purchases), also check the promotions from Xiaomi - sometimes the company holds eco-marathons with gifts for recycling equipment.
⚠️ Warning: If the battery is swelled or damaged, don't keep it at home! Lithium-ion batteries can spontaneously ignite. Place it in a non-combustible container (for example, a metal jar) and dispose of it as soon as possible.
8.Alternative ways to extend the life of the battery (if replacement is not an option)
If you are not ready to change the battery, you can try to extend its life using software and hardware methods:
- 🔄 Resetting settings (sometimes helps with charge controller failures). → Additionally. → Recovery and discharge.
- ⚡ Disabling background activity (in Settings) → Battery → Optimization).
- 🌙 The use of a dark topic (on AMOLED-The screen saves up to 15% of the charge).
- 🔋 Charging up to 80% (lithium-ion batteries last longer in part-cycle).
- 📵 Shutdown 4G/LTE (If the signal is weak, the communication module severely depletes the battery).
You can also try to flash your phone to custom firmware (like LineageOS), which optimizes power consumption better, but it's risky, because if you make a mistake, you can get a brick.
If the phone is running out of charge due to a damaged charging connector (bad contact), you can clean it with a toothpick dipped in alcohol. But if the connector is shattered, it's better to replace it in the service (worth it). ~500 ₽).
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None of these methods will restore the battery to its original capacity, but it can extend its life by a long time. 3-6 months.