Why does the Redmi 7A battery fail and when does it change?
Xiaomi Redmi 7A, released in 2019, is equipped with a non-removable battery with a capacity of 4000 mAh. Despite the stated resource of 500-800 charging cycles, after 2-3 years of active use, many owners face problems: the phone discharges in a few hours, turns off at 20-30% charge or does not hold charging at all.
The main signs that the battery is time to replace:
- ⚡ Bloating of the body - the screen or back cover begin to "step away" from the frame, gaps appear.
- 🔋 Instant discharge – the smartphone loses 50% of its charge in 10-15 minutes or turns off in the cold.
- 🔌 Charging problems – the phone does not recognize the charger, charges only in a certain position of the cable.
- 📉 System errors – notifications such as “Battery damaged, contact the service” appear".
If you notice any of these symptoms, you can't pull the plug. A ballooning battery can damage the display, the motherboard, or even cause a fire. Fortunately, you can replace the battery with a Redmi 7A yourself, but you can follow the instructions and save on the quality of the parts.
What tools will you need to replace?
To disassemble the Xiaomi Redmi 7A and install a new battery, you will need a minimum set of tools, most of which can be purchased from electronics stores or ordered from AliExpress in smartphone repair kits.
| Tool. | Appointment | Where to buy / price |
|---|---|---|
| Plastic shoulder blades (mediator) | For careful putting of the cover and disconnecting of plumes | AliExpress, 50–100 ₽ set |
| Cross screwdriver (PH00) | For twisting the screws of the back cover | Any hardware store, 100-150 ₽ |
| Suction cup (for screen) | Helps to lift the back cover after heating | AliExpress, 80–120 ₽ |
| Fryer-dryer | To soften the glue under the lid | Household stores, from 1,000 ₽ |
| Tweezers (thin, curved) | To remove plumes and extract small parts | AliExpress, 50–80 ₽ |
Important: Do not use metal blades or knives – they can damage plumes or leave scratches on the body. Also avoid too powerful hair dryers (optimal heating temperature is 60-80 ° C) to not melt the plastic.
⚠️ If you don't have any experience with electronics, you should trust the replacement to professionals, and if you don't unplug the battery plume properly, you can short-circuit and crash the motherboard.
Buy an original or high-quality battery (capacity 4000 mAh)
Charge your phone to 30-50% (bloated battery cannot be charged!)
Prepare the workplace (clean table, good lighting)
Make a backup copy of the data (in case of resetting settings)-->
How to choose a high-quality battery for Redmi 7A?
The choice of battery will not only determine battery life, but also the safety of your smartphone. There are three types of batteries on the market for the Redmi 7A:
- Original (Xiaomi) – the most reliable, but also the most expensive (1500-2500) ₽). Sold in branded service centers or on official sites (Mi Store, AliExpress from trusted sellers).
- Premium analogues are batteries from well-known manufacturers (for example, Patona, Baseus). ₽), but often not inferior to quality.
- Cheap fakes – sold in markets or in questionable online stores for 300-500 ₽. The risk of blistering or fire is extremely high!
When buying, pay attention to:
- 🔍 Capacity – should be exactly 4000 mAh (don’t believe the sellers promising 5000 or 6000 mAh – this is a scam).
- 📄 Certificates – quality batteries have labels CE, RoHS or UL.
- 📦 Set - the set should be adhesive strips for fixation and protective film.
- ⭐ Reviews – Check seller ratings and buyer comments (especially look at photos of real batteries).
Where to buy? Best options:
- 🛒 Xiaomi official stores (warranty 6-12 months).
- 🌍 AliExpress (sellers with a rating above 98% and the number of orders) >1000).
- 🔧 Service centers (sometimes sell original parts from the warehouse).
How to distinguish the original battery from a fake?
Step-by-step: how to disassemble the Redmi 7A and replace the battery
Before starting work, be sure to turn off the phone and remove it. SIM-We also recommend that you take a video of the process, which will help you reassemble your smartphone if you forget the location of the parts.
Step 1: Removing the back cover
The Redmi 7A's back cover is glued around the perimeter to remove it.
- Heat the edge of the body with a hair dryer (10-15 seconds on each side) at a distance of 5-7 cm.
- Apply a suction cup to the bottom of the phone (near the USB-C connector) and pull up slightly.
- In the resulting gap insert a plastic spatula and carefully lead it around the perimeter, separating the glue.
Do not make excessive efforts – if the lid does not lend itself, warm it up again.
Step 2: Disconnect the battery plume
When you take the lid off, you'll see the battery covered with a black protective film. Don't pull it, it's got a plume underneath that you need to disconnect first!
- Unscrew 4 screws that fix the metal plate above the plume (use the PH00 screwdriver).
- Carefully attach the battery plume connector (it is white) with a plastic spatula and disconnect it from the motherboard.
⚠️ Attention, if you accidentally close the contacts of the battery with a metal tool, it can cause fire!
Step 3: Remove the old battery
The battery in the Redmi 7A is glued to the body with double-sided tape to remove it.
- Tap the battery with a plastic spatula from any corner and pull up.
- If it doesn’t lend itself, warm it with a hair dryer (no more than 60°C!) and try again.
- Don’t pull the plume – it can come off!
Dispose of old batteries according to the rules of your region (usually there are special reception points in electronics stores).
Step 4: Installation of a new battery
Before installation, check that the new battery has a protective film (if it is not, stick tape on the contacts to avoid circuiting).
- Remove the protective film with the adhesive side of the battery and gently press it against the body.
- Connect the plume to the connector on the motherboard (it should click with a slight click).
- Turn back the metal plate and screws.
Step 5: Assembly of the phone
Make sure all plumes are connected correctly and gently glue the back cover. For reliable fixation, you can use double-sided tape or a special glue B-7000 (a thin layer on the perimeter).
After assembly:
- ⏳ Let the glue dry (2-3 hours).
- 🔌 Connect your phone to charge and check if the new battery is recognized.
- 📱 If the smartphone does not turn on, check the connection of plumes or contact the service.
💡
If the phone discharges quickly after replacing the battery, calibrate the battery: completely discharge it, then charge it to 100% without interruptions. Repeat the procedure 2-3 times.
What if there are problems after replacing the battery?
Even if you've done everything right, sometimes you have problems, and let's look at the most common ones and how to fix them.
| Problem. | Possible cause | Decision |
|---|---|---|
| Phone's off. | Unconnected battery plume or damage to contacts | Take the phone apart and check the connection of the plume, if necessary, clean the contacts with alcohol. |
| Fast discharge. | Poor battery or uncalibrated battery | Calibrate (discharge/charge 3 times in a row) or replace the battery with the original one. |
| Phone's warming up. | Poor thermal conductivity (air gaps after assembly) | Take the phone apart and check if the battery fits tightly. Add a thermal paste if necessary. |
| No charge is determined | Damaged USB-C connector or battery plume | Check the connector for debris. If there's a problem, replace the plume. |
If none of these things worked, maybe the problem is the power controller on the motherboard, and you'd better go to the service center.
💡
90% of battery problems are due to improper connection of plumes or use of defective parts. Always check the battery compatibility with the model phone!
How much does it cost to replace a battery in a service center?
If you're not sure about your ability, you can trust a battery replacement to a professional, and the cost depends on the type of battery and the region:
- 🏙️ Moscow/St. Petersburg:
- 🌍 Regions of Russia:
- 🛠️ Self-sustaining replacement:
The average replacement time in the service is 30-60 minutes, and many workshops provide a guarantee for work (from 1 to 6 months).
Tip: Before contacting the service, check the reviews about the workshop on Yandex.Maps or 2GIS. Avoid salons with low rating or without warranty.
How to extend the life of a new battery?
To keep your new battery lasting as long as possible, follow these guidelines:
- 🔌 Use the original charger (or certified with Quick Charge 3.0 support). Cheap charges ruin the battery.
- 🌡️ Avoid overheating and hypothermia. Optimal operating temperature - from +10°C +35°C.
- 🔋 Don't discharge your phone to 0%. It's better to recharge it at 10-20% charge.
- 📵 Disable unnecessary functions (GPS, Bluetooth, 4G), unless they are used.
- 🔄 Calibrate the battery every 2-3 months (full discharge) + charge to 100%).
It is also useful to turn off the background activity of applications:
- Go to Settings → Battery → Energy Saving Mode.
- Select "Limit background activity" for unnecessary programs.
- Activate the option "Adaptive battery" (it automatically optimizes energy consumption).
💡
Compliance with these rules can increase the battery life by 30-50%, reducing the frequency of replacement from 2 to 3-4 years.