Why the Redmi 5 Plus Battery Fails and When to Change It
Smartphone Xiaomi Redmi 5 Plus (codename Vince) was released in 2018 and was equipped with a lithium-polymer battery with a capacity of 4000 mAh. Even with careful use after 3-4 years, the original battery loses up to 30-40% of capacity - the device discharges in a few hours, turns off at 20-30% charge or overheats during charging. If your Redmi 5 Plus became to "hold" charge for less than a day at moderate load, most likely it's time to replace the battery.
The main signs of battery wear:
- ⚡ Fast discharge (from 100% to 0% in 4-6 hours without active use).
- 🔥 Overheating of the body in the battery area (especially when charging or playing).
- 📉 Abrupt shutdown at 15-30% charge (symptom of a “sudden shutdown»).
- 🔌 Slow charging or no response to the charger.
- 📊 Bloating of the back cover (visually noticeable if you put the phone on a flat surface).
Before you start a replacement, check the battery status through an engineering menu or an application like AccuBattery. If the capacity has dropped below 2500-3000 mAh and the number of charging cycles exceeds 500-600, a replacement is inevitable, otherwise you risk battery bloating, which can damage the screen or motherboard.
Which battery to choose for Redmi 5 Plus: original vs analogues
There are three types of batteries available for the Redmi 5 Plus:
- Original (OEM) — are manufactured by Xiaomi or official partners (e.g. Sunwoda or ATL). Code-marked MBJ402430 or BM43, They have a capacity of 4000 mAh and a warranty of 6-12 months. Cost: 1500-2500 ₽.
- Certified analogues - are produced by the brands Baseus, Remax, Patona under the license of Xiaomi. Capacity 3800-4000 mAh, price 800-1500 ₽. Often equipped with replacement tools.
- No-name: Cheap, unlabeled batteries (500–1000) ₽). Risk of poor quality, bloating or rapid wear.
| Type of battery | Capacity | Term of service | Price. | Pluses | Cons |
|---|---|---|---|---|---|
| Original (OEM) | 4000 mAh | 3-4 years | 1500–2500 ₽ | 100% Compatibility, Long Lifetime | High price, risk of counterfeiting |
| Certified analogue | 3800-4,000 mAh | 2–3 years | 800–1500 ₽ | Good Price/Quality Relationship | It's worse to hold the charge. |
| No-name | 3,500 to 4,000 mAh | 1-2 years | 500–1000 ₽ | Low price | Risk of bloating, low capacity |
When buying, pay attention to:
- 🔍 Marking: Original must have Xiaomi hologram and serial number.
- 📦 Package: the box must have a protective film and instructions.
- 🔋 Production Date: Fresh batteries (2023–2026) will last longer.
- 🛡️ Guarantee: Official sellers have a minimum of 6 months.
⚠️ Warning: Buy batteries only from trusted sellers (e.g. Mi Store, AliExpress Official Store, Beru with high ratings). counterfeits for the original often have a capacity of 2500-3000 mAh instead of the declared 4000 mAh.
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Before buying, check the reviews about the seller – they often mention the actual battery capacity after testing.
Battery Replacement Tools: What You Need
To replace your battery on Redmi 5 Plus, prepare the following set of tools:
- 🔧 Plastic blades (spudger) - for careful liding and disconnection of plumes.
- 🔨 Cross screwdriver (PH00 or PH0) — rear-cover.
- 🧲 Magnetic mat or organizer – to avoid losing small details.
- 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
- 🧴 Isopropyl alcohol (90%+) — glue-residue.
- 📏 Plastic card or mediator – for separation of the battery.
- 🔋 New battery - with proven capacity and components.
- 🛠️ Suction (optional) - helps to remove the back cover.
If you do not have experience disassembling smartphones, we recommend you to purchase a special kit for replacing the battery (cost 300-500). ₽). It usually includes all the necessary tools, including a device for retrieving the battery.
⚠️ Warning: Do not use metal screwdrivers to smack the battery, this can break through the battery body and cause a short circuit. Also avoid overheating with a hairdryer (maximum 80).°C) so as not to damage the screen or motherboard.
Turn off the phone and remove it. SIM-map|Charge the battery to 30-50% (for safety)|Prepare a workplace with good lighting|Make a backup of the data (in case of errors)|Wear an antistatic bracelet or touch a grounded object-->
Step-by-step: how to disassemble the Redmi 5 Plus and replace the battery
The battery replacement process consists of 5 steps. Follow the instructions carefully so as not to damage the plumes or contacts.
Step 1: Removing the back cover
1. Turn off the phone and remove the tray for SIM-map.
2. Heat the hair dryer around the perimeter for 1-2 minutes (hold the hair dryer at a distance of 5-10 cm).
3. Insert a plastic blade into the gap between the lid and the body (start at the lower left corner where the antenna is located). Carefully drive the blade along the edge, separating the latches.
4. After removing the lid, put it aside - it will be useful for reverse assembly.
Step 2: Disconnecting the plumes and batteries
1 Unscrew 10 screws that fix the metal plate (use a screwdriver PH00). Remove the plate and put it away.
2. With a plastic shoulder blade, gently disconnect the plumes:
- 📶 Antenna connector (upper left corner).
- 🔊 Dynamic connector (lower right corner).
- 🔋 Battery connector (center, under black insulation).
3. Put a black insulation tape on the battery and take it off. Under the tape, you'll see the battery connector -- unplug it.
Step 3: Remove the old battery
1. Carefully pull the tongue under the battery (if there is one).If the tongue is not, use a plastic card to separate the battery from the housing.
2. Pull the battery off the edge, gradually moving towards the center. If the battery is glued heavily, apply a few drops of isopropyl alcohol under it and wait 1-2 minutes.
3. After extraction, inspect the tray under the battery - remove the residues of glue with alcohol and a napkin.
⚠️ Warning: If the battery is swelling, do not puncture it or bend it. Carefully remove and dispose of it at a special reception point (blown Li-Pol batteries can ignite!).
Step 4: Installation of a new battery
1. Check the contacts of the new battery - they should match the old ones. If necessary, move the insulation tape.
2. glue bilateral tape (usually complete with battery) to the bottom of the tray and install the battery, slightly pressing it.
3. Connect the battery connector to the motherboard. Make sure it's tightly fixed.
Step 5: Reverse Assembly
1. Connect all the plumes in reverse order (antenna → speaker → battery).
2. Install a metal plate and twist the screws (do not tug!).
3. Stick the back cover. You can use a new adhesive side for reliability (sold in remixes).
4. Turn on the phone and check the battery.
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After the battery is replaced, perform 2-3 full charge/discharge cycles (0% to 100%) to calibrate the power controller.
What to do after replacement: calibration and testing
Replacing the battery is only half the battle, and to make the new battery work properly, you need to:
- Calibrate the charge controller: 🔋 Discharge your phone before automatically shutting down. 🔌 Charge to 100% without interruption (use the original RAM). 📱 Repeat the cycle 2-3 times.
Check the temperature.
Update.
Settings → About the phone → System update
For diagnosis, use the applications:
- 📊 AccuBattery – shows real capacity and wear.
- 🔍 AIDA64 — displays the temperature and voltage of the battery.
- 📈 CPU-Z — Checks the stability of the work after replacement.
If you have replaced the phone:
- ❌ Not turned on – check the connection of the battery plume.
- ❌ Quickly discharged - possible battery failure or incorrect calibration.
- ❌ Overheats – remove the remnants of old glue, they can interfere with heat removal.
What if the phone doesn’t turn on after replacement?
Top.-5 Errors when replacing the battery with Redmi 5 Plus
Even experienced users sometimes make mistakes that cause their phones to break down.
- Using metal tools - battery piercing can cause fire. Always use plastic blades.
- Overheating with a hair dryer – temperatures above 80°C damage the screen and adhesive bases. Keep the hair dryer at a distance and do not heat one point for longer than 20 seconds.
- Incomplete disconnection of the plumes - if you forget to disconnect the antenna connector, you can break it when removing the cover.
- Ignoring calibration – without the right “swing” of the new battery, the phone will show an incorrect percentage of charge.
- Buying cheap no-name batteries – they often have a real capacity of 2000-2500 mAh instead of the declared 4000 mAh.
If you're not sure about your abilities, you should contact a service center, and the average cost of replacing a battery in a workshop is 1,000-1500. ₽ (But a self-replacement will be cheaper and provide invaluable experience.