Xiaomi Redmi Note 5A is one of the most popular budget smartphones of 2017, but even its reliable battery capacity of 3080 mAh after 5-7 years of operation begins to “die”: the phone discharges in an hour, turns off at 30% charge or refuses to turn on. If your Redmi Note 5A began to “glutch” with the battery, do not rush to carry it into service – you can replace the battery yourself, saving up to 70% of the cost of repair.
In this article, you will find step-by-step instructions with a photo, tips on choosing an original or quality alternative battery, as well as unique nuances of disassembly Redmi Note 5A that are not mentioned in 90% of the manuals (for example, how to safely detach the fingerprint scanner plume without damage), we will also analyze what tools are really needed and what you can do without, and what to do if the phone does not turn on after replacing.
We warn you right away: the process is not the easiest because of the adhesive fastening of the battery, but with the right approach, even a beginner can cope, the main thing is to take your time and follow our recommendations.
Signs that the battery Redmi Note 5A is time to change
Sometimes the problem is software failures or the background power consumption of applications, but there are 5 key symptoms that are 99% likely to indicate battery wear:
- 🔋 The phone discharges by 50-70% in 1-2 hours with minimal load (for example, in standby mode).
- 🔌 Charging jumps: it shows 100%, then suddenly drops to 10-20% after restarting.
- 🔄 The smartphone turns off at 20-30% charge and turns on only after connecting to the charger.
- 🌡️ The battery is swollen (see on the raised screen or body - check by putting the phone on a flat surface).
- ⚡ The phone warms up more than usual during charging or work.
If you see at least 2 to 3 of the features on the list, the battery is likely degraded, and you can check it with apps like AccuBattery (revealing real capacity) or an engineering menu (enter #4636# and select Battery Information). If the actual capacity is less than 2000 mAh, a replacement is inevitable.
⚠️ Warning: If the battery is swelling, you can't pierce it or try to flush it! This can cause fire, in which case, immediately turn off the phone and replace the battery.
What battery to choose for Redmi Note 5A: original vs analogues
The battery quality is not only the life of the phone, but also the safety of the phone. Cheap fakes can swell in a month or even ignite.
| Type of battery | Advantages | Deficiencies | Average price (2026) |
|---|---|---|---|
| The original (Xiaomi) | Compatibility guarantee, long service life, safety | Expensive, difficult to find on sale (not officially supplied) | 2500–3500 ₽ |
| Quality analogue (e.g. Patona, Baseus) | Cheaper than the original, good reviews, often exceed the declared capacity | The risk of a fake may vary slightly in size. | 1200–1800 ₽ |
| Budgetary analogue (no-name) | Very cheap, they deliver quickly. | High risk of bloating, small real capacity, short service life | 500–900 ₽ |
We recommend that you focus on quality analogues from proven brands: the original batteries for the Redmi Note 5A are no longer produced, and the market is full of fakes under the guise of “originals”.
- 🔍 Marking: the battery must be marked with a model (BM47 For the Redmi Note 5A), Capacity (3080 mAh), voltage (3.85V) production date.
Where to buy? Best options:
- 🛒 Xiaomi's official stores (if the original appears suddenly).
- 🌍 AliExpress (stores with a rating above 98% and reviews with photos).
- 🏬 Local service centers (often sell quality analogues wholesale).
💡
Before buying, check the battery reviews by its serial number, for example, search for BM47 3080mAh reviews to help avoid counterfeiting.
Preparing for replacement: security tools and measures
To replace the battery with the Redmi Note 5A, you will need:
New battery (compatibility tested)| Plastic blade or mediator (2-3 pieces)|Cross screwdriver (PH00 or PH0)|Furnish or thermal air station (to soften glue)|Suction cup (optional)|Tinzet (better with curved ends)|Isopropyl alcohol (90%+) and cotton swabs|Scotch or double-sided tape (for fixing plumes)-->
Why these tools?
- 🔧 Plastic blade is needed so as not to damage the plumes during disassembly (metal tools risk piercing the battery!).
- 🔥 The dryer will help soften the glue on which the battery is held, and without it, you risk tearing the battery when you try to remove it.
- 🧴 Isopropyl alcohol removes the glue residue and cleans the contacts. Don't use acetone or solvents, they'll damage the plastic!
⚠️ Warning: Before starting work, completely discharge your phone (before turning off automatically) to minimize the risk of short circuits when the battery is disconnected. Also work with gloves - lithium batteries contain toxic substances.
Where is the best place to replace?
- 🪑 On a table with good lighting (ideally - a lamp with a magnifying glass).
- 📱 On a soft substrate (for example, on a silicone mat) so as not to scratch the screen.
- 🔌 Far from water and open sources of fire (even the charger is better to turn off).
What happens if you don’t empty your phone before you replace your battery?
Step-by-step: how to disassemble the Redmi Note 5A and replace the battery
Now, to the most critical stage, follow the instructions in strict order so that no plumes or boards are damaged.
Step 1: Removing the back cover
1. Turn off the phone and remove the tray for SIM-map.
2. Heat the back end edge with a hair dryer (~60°C) for 1-2 minutes. This will soften the glue.
3. Put the lid on a plastic blade starting at the lower left corner (there are fewer plumes). Carefully drive the shoulder blade around the perimeter, separating the latches.
4. Remove the lid and put it aside. Be careful, it's got a fingerprint scanner plume glued to it!
Step 2: Battery disconnection
1 Unscrew 10 screws that fix the metal plate over the battery (use the PH00 screwdriver).
2. Carefully lift the plate and put it down, and below it you will see a battery connector (a white connector with red and black wires).
3. Tweezers, pull the connector and unplug it from the motherboard.
4. Heat the battery with a hairdryer (again ~60°C) for 3-5 minutes to soften the glue.
Step 3: Remove the old battery
1. Put a plastic blade on the battery from any angle and slowly pull up. If the glue doesn't lend itself, heat it up again with a hair dryer.
2.Do not bend the battery and do not use force - if it does not come out, then the glue has not softened sufficiently.
3. After extraction, clean the place under the battery of glue residues with isopropyl alcohol and cotton swab.
Step 4: Installation of a new battery
1. Check that the new battery has a protective film (if not, paste tape on the contacts to avoid short circuit).
2. glue a double-sided tape to the bottom of the compartment (or use glue if it came complete with the battery).
3. Install the battery, making sure it fits tightly to the body.
4. Connect the connector to the motherboard (it should click with a slight click).
Step 5: Assembly of the phone
1. Put the metal plate back in place and twist all 10 screws.
2. Connect the fingerprint scanner plume (if it has detached) and gently press the back cover.
3. Close the lid, starting at the top, and snap it around the perimeter.
💡
The hardest part is removing the old battery, and if the glue doesn't work, don't break it, so you better heat it with a hair dryer or use a special solvent for the glue (e.g. iFixit Adhesive Remover).
What if the phone doesn’t turn on after the replacement?
If the Redmi Note 5A doesn't respond to the power button after the battery is replaced, don't panic. 90% of the time, the problem is solved simply by:
- 🔌 Check the battery connector, it may not be fully inserted into the connector.
- 🔋 Charge the phone for 10-15 minutes: the new battery can be completely discharged.Plug in the original charger and wait.
- 🔄 Drop the cache: pinch the volume up + Power for 10-15 seconds to reset temporary data.
- 🛠️ Check the plumes: If the phone vibrates when connecting the charger, but does not turn on, the screen plume or power button may have moved away.
If nothing helps, the reason may be:
- 🔥 Short circuit (check the fee for blackened elements).
- 🔌 Damaged power controller (requires diagnostics in the service).
- 📱 A faulty new battery (this happens with cheap analogues).
⚠️ Warning: If the phone turns on but turns off immediately, don't plug it into charging - this could be a sign of a short circuit.
Calibration of the new battery: why is it important?
Once the battery is replaced, it needs to be calibrated so that the power controller can correctly determine the level of charge, and without calibration, the phone can show the wrong percentage or quickly discharge.
How to do this:
- Completely discharge the phone before automatically shutting down.
- Connect the original charger and charge for at least 8 hours (even if the indicator shows 100%).
- Turn off the charger and turn on the phone. If it shows less than 100%, re-connect the charger for 1-2 hours.
- Repeat the discharge / charge cycle 2-3 times.
We also recommend:
- 📵 Do not use your phone during the first charge.
- 🔌 Use only original RAM (or certified with Quick Charge 3.0 support).
- 🌡️ Avoid overheating (do not put your phone on charging under direct sunlight).
After calibration, the new battery will last longer and the charge indicator will be more accurate. If after 2-3 cycles the phone still discharges quickly, check the background processes in Settings → Battery or install the Greenify application for optimization.
How long will the new battery last and how to extend its life?
The battery life depends on its type and operating conditions:
| Type of battery | Average service life | How do I extend it? |
|---|---|---|
| The original (Xiaomi) | 3–4 years (500–600 cycles) | Use the original RAM, avoid complete discharge |
| Quality analogue | 2–3 years (400–500 cycles) | Calibrate once every 3 months, do not overheat |
| Budgetary analogue | 6–12 months (200–300 cycles) | Charge only up to 80%, avoid loads when charging |
To maximize the life of a new battery:
- 🔋 Do not discharge below 20% and do not charge above 90% (ideal range is 30–80%).
- 🌡️ Avoid extreme temperatures (optimum 10-35)°C).
- 📵 Do not play heavy games while charging.
- 🔌 Use only certified RAM (cheap charging ruins the battery).
- 🔄 Calibrate once every 3 months (full discharge/charging cycle).
If you follow these rules, even a budget battery will last 30-50% longer, and a quality analog or original easily last 3-4 years without noticeable degradation.