Xiaomi Redmi 8A is one of the most popular budget smartphones, but over time, even its reliable battery capacity of 5000 mAh begins to lose capacity. If the phone runs out in half a day, turns off at 20-30% charge or the case is swollen, it's time to think about replacing the battery. In the service center for this procedure will take from 1500 to 3000 rubles, but with the tools and patience you can cope with yourself in 30-40 minutes.
In this article, you will find a step-by-step photo instruction, a list of necessary tools, tips for choosing a quality battery and unique nuances for the Redmi 8A model (for example, the features of fastening the battery plume and the risks of damage to the flexible power button cable).
Warning: the procedure requires care, if you've never taken your smartphone apart, practice on an old device or watch a video demo before you start work, and remember, self-repairing is not warranty (if it's still valid).
Signs that the Redmi 8A battery needs to be replaced
Take your phone apart at the first sign of a quick discharge, sometimes it's software failures or apps' background power consumption, and the following symptoms indicate that the battery has actually failed:
- 🔋 The phone turns off when 20-40% charge and only activated after connection to charging.
- ⚡ Battery life has been reduced in 2-3 compared to the new state (for example, instead of a day - only a day) 6-8 hours).
- 📏 The case of the smartphone swelled - between the screen and the back cover there was a gap, and the glass or panel bent outwards.
- 🔥 The phone gets very hot during charging or operation (especially in the battery area).
- ⚠️ The screen displays a warning: "Battery damaged. Contact the service." MIUI 12 and newer).
If you have at least 2-3 items on your Redmi 8A list, it's likely that your battery has degraded, and you can check its status using apps like AccuBattery (showing real capacity) or through an engineering menu:
- Open the Phone app.
- Dial ##4636###.
- Go to the Battery Information tab and see the Health Level parameter.
⚠️ Warning: If the battery is swelling, don't delay replacement! These batteries can leak or ignite. Don't try to prick or squeeze a bloated battery - it's dangerous!
What tools will be needed to replace
To replace the battery with the Xiaomi Redmi 8A, you will need a minimum set of tools, most of which can be bought in Chinese stores (for example, on AliExpress) or in specialized stores for repairing equipment.
| Tool. | Appointment | Where to buy / price |
|---|---|---|
| Plastic spatula (mediator) | For careful slashing of the back cover and disconnection of plumes | AliExpress, 50-100 ₽ |
| Cross screwdriver (PH00 or PH0) | For spinning the screws of the back cover | Any tool store, 100-200 ₽ |
| Screen suction cup | Helps remove the back cover without damaging it. | AliExpress, 80-150 ₽ |
| Tweezers (preferably magnetic) | For easy removal of screws and plumes | AliExpress, 100-300 ₽ |
| Isopropyl alcohol (90%+) and cotton swabs | To clean contacts and remove old glue | Pharmacy or electronics store, 150-250 ₽ |
Also prepare a new battery (read the next section about the choice), heat-glue or double-sided tape to lock the battery, and a hair dryer (if the lid is glued too tightly).
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Before you start, take a picture of all the screws and plumes on your phone, which will help you put the device back together properly, especially if you're taking your smartphone apart for the first time.
How to choose a high-quality battery for Redmi 8A
The quality of the new battery depends on how long it lasts and how safe it will work, and there are many fakes on the market that can swell in a month or fall short of the declared capacity.
- 🔍 Original article: For Redmi 8A it MB-J40 or BM4D (Check the markings on the old battery.
- 📦 Capacity: Must be 5000 Fakes are often used for fakes. 4000-4500 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.
- 🏭 Manufacturer: Official batteries are made ATL (Amperex Technology Limited or SDI (Samsung? Famous substitute brands: ZOP Power, Camelion.
- 🛡️ Protection: The battery must have a charge controller (a small fee on the train) and the marking of Li-Polymer.
- 💰 Price: The original battery is worth it 1200-1800 ₽. Cheap options (500-800 ₽) mostly forgery.
Where to buy:
- ✅ Xiaomi official service centers (the most reliable option).
- ✅ Verified online stores: MegaBattery, AllBatteries, AliExpress (sellers with a rating above 98%).
- ❌ Doubtful sites: Avito, Yula, markets - high risk of running into used or defective battery.
After purchase, check the battery visually: it should not be scratched, dented or traces of glue, and ask the seller to show a certificate of quality (for the original batteries).
How to distinguish the original battery from a fake?
Step-by-step instructions for replacing the battery
Now, to the most critical stage, disassembling the phone and installing the new battery, follow the instructions carefully so that no plumes or other components are damaged.
Turn off the phone and remove it. SIM-memory-card|Charge your phone to at least 30% (if it’s still on)|Prepare the workplace: clean desk, good lighting|Wear an antistatic bracelet or periodically touch metal objects to relieve statics-->
Step 1: Removing the back cover
The back cover of the Redmi 8A is mounted on latches and glue to remove it.
- Heat the hair dryer of the edge of the cover (temperature) ~50-60°C) during 1-2 It'll soften the glue.
- Suction suction to the bottom of the lid (near the USB-C connector) and pull up.
- In the resulting gap insert a plastic spatula and carefully lead it around the perimeter, snapping the clamps.
Be careful in the area of the power button - there is a flexible plume that is easily damaged!
Step 2: Spinning the screws
Under the lid, you'll see 10 screws (9 crosses and 1 under the seal) unscrew them all except the screw under the seal, you don't have to touch it (it attaches the antenna module).
Attention! Rotors of different lengths -- remember where they were, or take a picture of their location.
Step 3: Disconnect the battery plume
The battery is glued to the body, but before you pull it out, you need to turn off the power:
- Find the battery plume (black connector with red and black wires).
- Carefully tuck it with a plastic spatula and disconnect it from the motherboard.
After that, you can start removing the old battery.
Step 4: Remove the old battery
The old battery is glued to double-sided tape to remove it.
- Tap the battery with a plastic spatula on either side and pull up.
- If the glue is too strong, heat the battery with a hairdryer (not higher than 60 ° C!) or drip a little isopropyl alcohol under it.
- Don’t pull the plume – it can come off!
Recycle your old battery according to your region’s rules (usually there are special reception points).
Step 5: Installation of a new battery
Before installing the new battery:
- Clean the place under the battery from glue residues with alcohol and cotton swab.
- Remove the protective film from the new battery (if any).
- Stick the battery onto double-sided tape or heat glue (don’t use superglue!).
- Connect the plume to the motherboard.
Step 6: Build the phone
Collect the phone in reverse order:
- So, turn all the stains (not to be worn).
- Install the back cover starting at the top (near the camera).
- Warm up the hair dryer of the edge of the lid so that the glue is better grasped.
⚠️ Warning: After you change the battery, don't turn the phone on right away! 10-15 minutes to keep the lid firmly in place.
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The most critical thing is to disconnect the battery plume, and if you accidentally tap the motherboard screwdriver when the battery is on, it can short-circuit and cause the phone to fail!
Calibration of the new battery
To make the new battery work properly and show the exact level of charge, it needs to be calibrated, which takes about a day, but significantly extends the battery life.
Calibration instructions:
- Use your phone until it turns off (0%).
- Charging to 100%: Connect the original charger and charge the phone until full (don’t interrupt the process!).
- Additional Charging: After reaching 100%, leave your phone on charging for another 1-2 hours.
- Repeat cycle: Re-discharge/charge another 2-3 times.
It is also recommended that:
- 📵 First. 3-5 Do not use your phone while charging (this helps the battery controller to get used to the new capacity).
- 🔌 Use only an original or certified charger (charging current should not exceed 2A for Redmi). 8A).
- 🌡️ Avoid overheating your phone (do not charge it in direct sunlight or near heat sources).
After calibration, check the actual battery capacity in the AccuBattery app, which should be close to 5000 mAh (permissible deviation - ±5%).
Common Mistakes When Replacing a Battery and How to Avoid Them
Even experienced craftsmen sometimes make mistakes that cause a phone to break down, and here are the most common ones and ways to prevent them:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Damage to the power button plume | The button stops working, the phone doesn't turn on. | Carefully lift the cover in the area of the button, use a plastic spatula |
| Tug-tug screws | The thread breaks, the body or motherboard cracks. | Write screws with moderate effort, do not use metal screwdrivers. |
| Use of a non-original battery without a controller | Battery swells quickly, phone does not determine the level of charge | Buy batteries with Li-Polymer label and charge controller only |
| Incomplete shutdown of battery plume before retrieval | Short circuit, failure of the motherboard | Always check if the plume is disconnected before touching other components. |
| Using superglue to lock the battery | The glue hits the contacts, the battery does not hold or damages the body | Use only bilateral Scotch or heat-glue |
If the phone does not turn on after replacing the battery, check:
- 🔌 Is the battery plume connected to the motherboard.
- 🔧 Whether all screws are twisted (untwisted screws can cause short circuits).
- 🔋 Polarity of battery connection (plus to plus, minus to minus).
If nothing works, the motherboard may have been damaged, in which case you should contact the service center.