Why the Redmi Note 5 Battery Fails and When to Change It
Xiaomi Redmi Note Smartphone 5 (codename Whyred was released in 2018 year, and even with careful use of its original battery capacity 4000 mh 2026 year-over-year 30-40% It's not the manufacturer's fault that lithium polymer batteries degrade over time due to chemical processes, charging cycles and temperature changes.
How do you know if the battery is going to change?
- 🔋 Phone's running out of power. 2-3 with moderate use (social networks, messengers), although earlier kept the day.
- 🔌 Charging jumps: for example, from 30% immediately falls to 1% or the phone turns off at 20% of the remainder.
- 🔥 The body is noticeably heated in the battery area (especially when charging or playing games).
- ⚡ The phone does not turn on without charging, even if it shows 10-15% charge.
If you see at least two of these symptoms, battery replacement is inevitable. It's dangerous to delay the procedure: a bloated battery can damage the screen, the motherboard, or even ignite. Service centers charge between 1,500 and 3,000 rubles for replacement, but with the tools and patience, you can do it yourself.
Which battery to choose for Redmi Note 5: original vs analogues
The original battery for the Redmi Note 5 has an MBJ405830 and a capacity of 4000 mAh. However, after 2020, Xiaomi officially stopped supplying spare parts for this model, so the market is dominated by analogues.
| Type of battery | Advantages | Deficiencies | Price (2026) |
|---|---|---|---|
| Original (b/u) | Guaranteed quality, exact dimensions | Hard to find, wear possible | 2000–3500 ₽ |
| Analogues (Baseus, Remax) | New battery, affordable price | It may not match the declared capacity. | 800–1500 ₽ |
| Increased capacity (5000-6000 mAh) | Longer working without recharging. | The thickness of the original, may not fit into the body | 1200–2000 ₽ |
When buying an analogue, pay attention to:
- 📏 Size: The original battery has dimensions 152×73×3,85 Check with the seller the exact parameters.
- 🔌 Connector: must be 3-pin (three contacts) with the thermistor for temperature control.
- 🔋 Capacity: real capacity is often understated.
- 🛡️ Protection: high-quality analogues have a protection scheme against overheating and short circuit.
⚠️ Warning: Don't buy batteries that say "High Copy" or "Super Copy" -- these are fakes with undercapacity and no protection. They can swell after a month of use.
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Before you buy, ask the seller to send a photo of the battery with a multimeter showing the voltage. The norm for a new battery is 3.7-3.85 V.
Preparing for replacement: tools and safety
To replace the battery in Redmi Note 5, you will need:
Screen suction cup (∅ 5-7 cm)
Plastic mediators or guitar plectras (2-3 pieces)
Cross screwdriver PH00 or PH0
Tweezers with curved ends
Thermoair station (dryer) or iOpener
Isopropyl alcohol (90%+) and lilac-free napkin
New battery with adhesive base
Double-sided Scotch (3M or similar)
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Also prepare the workplace:
- 🪑 Work at a table with good lighting (better to use a desk lamp).
- 🧲 Remove all metal objects – they can close contacts on the board.
- 🔌 Turn off the phone and turn it off. If the battery is swelling, don't turn on the device - risk short circuit!
- 📱 Make a backup of the data (via Settings) → Additionally. → Backup) as it may be lost during disassembly IMEI plume.
⚠️ Warning: If you've never taken a smartphone apart, practice on an old device or watch the Redmi Note 5 video disassembly on YouTube. The main challenge is to carefully separate the screen without damaging the plumes.
Step-by-step: how to disassemble the Redmi Note 5 and replace the battery
Follow the instructions carefully. If you have any difficulty at any stage, don't force it, just read the step again.
Step 1: Removing the back cover
1. Heat the back end edge with a hair dryer (60-70°C) for 2-3 minutes. This will soften the glue.
2. Suction the lid near the charging connector and pull it up. If the lid doesn't lend itself, warm it up again.
3. Insert a plastic mediator into the gap and guide it gently around the perimeter, separating the lid. Do not use metal tools!
Step 2: Shutting off the battery
1 Unscrew 10 screws (PH00) fixing the metal plate above the battery.
2 Carefully tuck the battery connector with a flat screwdriver and unplug it from the motherboard. Don't pull the wires!
3. Check the voltage on the contacts of the battery multimeter (should be 0 V). If there is a voltage, then the battery is not completely disconnected.
What to do if the screws do not unscrew?
Step 3: Remove the old battery
1. Put the battery on a plastic mediator on either side. If it's glued heavily, heat it with a hair dryer (maximum 80°C!).
2. Pull slowly, without jerking. If the battery is swelling, don't pierce it -- take it out carefully, even if it's deformed.
3. Remove the glue residue from the case with isopropyl alcohol. Do not use acetone - it will damage the plastic!
Step 4: Installation of a new battery
1. Remove the protective film from the adhesive base of the new battery and gently press it against the body.
2 Connect the battery connector to the motherboard. Make sure the contacts match.
3. Secure the battery with double-sided tape around the perimeter (especially if it is thinner than the original).
Step 5: Assembly of the phone
1. Place the metal plate in place and twist the screws (do not pull!).
2. Stick the back cover. Warm it up with a hair dryer (50°C) and press it for 1-2 minutes.
3. Turn on the phone and check the charge. If it shows 0%, plug in the charge for 30 minutes, then restart the device.
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After replacing the battery, be sure to calibrate the charge controller: completely discharge the phone, then charge to 100% without interruptions.
Frequent Mistakes and How to Avoid Them
Even experienced tycoons sometimes make mistakes when replacing the battery, and here are the most common problems and solutions.
| Mistake. | Effects of consequences | How to fix it |
|---|---|---|
| Screen plume damaged. | The touchscreen or display is not working. | Replace the plume (article MBJ405831) |
| The battery connector is not switched off before removal | Short circuit, board burnt. | Diagnostics in the service (possible replacement of the power controller) |
| The new battery is poorly glued | Battery's gone, phone's bugging | Re-adjusted to quality Scotch (3M 9448A) |
| A metal tool was used | Scratches on the case or board | Disguise scratches with a marker or replace the body |
If you have replaced the phone:
- 🔄 Not turned on: check the connection of the battery connector and the power plume.
- 🔋 No charge: Clean the charging socket with alcohol or replace the controller (MBJ405832).
- ⚡ Turns off when 20-30%: calibrate the battery (discharge) + full-load 2–3 once).
⚠️ Warning: If the battery warms more than usual after replacing, immediately turn off the phone and remove it.
How to prolong the life of a new battery
To make the new battery in Redmi Note 5 last longer, follow these rules:
- 🔌 Charging: Use the original adapter (5V/2A) or certified Quick Charge 3.0. Avoid cheap charging – it overheats the battery.
- 🌡️ Temperature: Do not leave your phone in the sun or near heat sources. Optimal range is 10-35°C.
- 🔋 Charge level: Try to keep the charge between 20% and 80%.Full discharges and 100% charging shorten lifespan.
- 📵 Storage: If you don't use your phone for long, charge it to 50% and turn it off. Every 3 months, turn it on and recharge it to 50%.
Myths about batteries that you should not believe:
- ❌ "You need to completely discharge the phone once a month, which was true for nickel batteries, but not for lithium polymers.
- ❌ "Charging at night spoils the battery — modern smartphones automatically turn off power at 100%.
- ❌ "Fast charging kills battery – Quick Charge is safe if you use certified equipment.
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Install the AccuBattery app (available on Google Play) to show real battery wear and help optimize charging cycles.
Should I change the battery myself or contact the service?
Independent battery replacement in Redmi Note 5 will cost 800-2000 rubles (battery cost + tools), while the service for the same work will ask for 2500-4000 rubles.
When to do it yourself:
- ✅ You have experience disassembling equipment (for example, cleaning a laptop or changing the screen).
- ✅ You are willing to spend 1-2 hours and act carefully.
- ✅ Phone is not warranty (self-repairing it will cancel it).
When is the best time to contact the service:
- ❌ Battery swollen and deformed the body (risk of damage to the board).
- ❌ You never had a screwdriver or soldering iron in your hands.
- ❌ You need a guarantee for work (in the service give 3-6 months).
If you decide to use the service, choose a proven workshop.
- 📝 Availability of work warranty and spare parts (minimum 3 months).
- 🔧 Use of original or certified batteries.
- 💬 Reviews on Yandex.Maps or 2GIS (especially on the quality of Xiaomi repairs).
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In Moscow and St. Petersburg, the replacement of the battery in the Redmi Note 5 is qualitatively done in the services of Xiaomi Service (official), FixPrice or TechnoDoctor.