How to replace the battery on Xiaomi Redmi 9A: a detailed guide with photos and nuances

When and why to change the battery on the Redmi 9A

Xiaomi Redmi 9A is one of the most popular budget smartphones, but even its reliable battery of 5000 mAh loses capacity over time. If your phone runs out in a few hours, turns off at 20-30% charge or the case is swollen, it's time to replace the battery. The service center will charge from 1500 to 3000 rubles for this procedure, but with the tools and patience you can do everything yourself.

This article provides step-by-step instructions with a photo, the choice of original or analog battery, a list of necessary tools and unique nuances of disassembly Redmi 9A, which are not in the standard manuals, we will also discuss how to check the new battery and avoid typical errors in the assembly.

Signs of battery wear: when exactly you need a replacement

Take your phone off the ground at the first sign of a quick discharge, perhaps a software problem or a background power problem, but there are clear signs that you're wearing out your battery.

• 🔋 The phone turns off when 15-30% charge and only activated after connection to charging.
• 📉 Bloating of the body (especially noticeable if you put the smartphone on a flat surface - it will "swing").
• ⚡ Battery's charging to 100% post 10-15 minutes, but just as quickly discharged.
• 🔥 Overheating in the battery area even with minimal load.
• 📊 Settings menu → Battery → The state of the battery capacity shows less than 80% of the original.

If at least two of these signs show up, the battery needs to be changed. The Redmi 9A does not support removable batteries, so you will need a complete disassembly of the case.

⚠️ Attention: A bloated battery can burst when pressed! Don't try to puncture or bend it, it can cause fire. If the case is severely deformed, take the phone to service.

Battery selection for Redmi 9A: original vs analogues

The battery quality of the phone is not only the life of the phone, but also the safety of the phone, with three types of batteries available for the Redmi 9A:

When buying, pay attention to:

• 📦 Packaging: Xiaomi’s original batteries come in branded hologram boxes.
• 🔍 Marking: The battery must have an inscription MB11 (model code for Redmi 9A) and capacity of 5000 mAh / 19.05 Wh.
• 📏 Sizes: 150.5 × 72.5 × 4.5 mm (permissible deviation) ±0.5 mm).

Where to buy? Xiaomi's official stores (Mi Store), proven marketplaces like AliExpress (sellers with a rating above 98%) or Beru. Avoid spontaneous markets and questionable online stores.

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Before buying, check the reviews about the seller - often under the guise of original batteries sell counterfeits with a capacity of 3000-4000 mAh instead of the declared 5000 mAh.

Tools required: What to prepare in advance

To replace the battery with Redmi 9A, you will need:

Screen suction cup (∅ 5-7 cm)

Plastic mediators or shoulder blades (2-3 pieces)

PH00 or Pentalobe P2 screwdriver (for Xiaomi screws)

Thin metal spatula or guitar mediator

Dryer or thermo-air station (for softening the glue)

Tweezers (to detach plumes)

Isopropyl alcohol (90%+) and cotton swabs (for cleaning contacts)

New battery (with or without adhesive base)

Bilateral Scotch or B7000 glue (if battery without glue)

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Pay special attention to the screwdriver: Redmi 9A uses five-point screws with a pentalobe slit (Pentalobe P2), but some batches may have cruciform (PH00). If you are not sure, buy a set with both types.

Also prepare the workplace:

• 🪑 Work at a table with good lighting.
• 🧲 Remove metal objects (to avoid damaging the plumes with a magnet).
• 📱 Take a photo of the original location of screws and plumes before disassembly.

⚠️ Warning: Do not use a knife or sharp metal objects to tamper with the case - this will damage plastic latches.

How to disassemble Redmi 9A and replace the battery

The battery replacement process takes 30-60 minutes at the first time.

Step 1: Turn off and prepare the phone

Turn off Redmi completely. 9A (Press the power button and select Turn it off. SIM-If the battery is swollen, do not turn on the phone until you replace it!

Step 2: Removal of the back cover

1. Heat the hair dryer edges of the rear panel (temperature 60-80 ° C, not higher!).

2. Suction the lid at the charging connector and gently pull up.

3. Insert a plastic mediator into the resulting gap and lead them around the perimeter, disconnecting the latches.

Important: Don't use force -- if the lid doesn't respond, warm it up again. In Redmi 9A, the latches are fragile!

Step 3: Unscrew the screws and remove the metal plate

1. Unscrew 10 screws (9 around the perimeter and 1 under the tray) SIM-map).

2. Remove the metal plate that covers the battery and the motherboard. It can be glued -- put it in a mediator.

Step 4: Disconnecting the battery plume

1. Carefully tuck the black battery connector (it is to the right of the camera).

2. Use a plastic spatula so that you don't damage your contacts. Don't pull the wires!

Step 5: Remove the old battery

1. Put a plastic shoulder blade on either side of the battery. In Redmi 9A, it's glued all around the perimeter.

2.If the glue is too strong, warm up the battery with a hairdryer (maximum 50°C!).

3. Remove the battery by pulling the pen ribbon (if any).

Step 6: Installation of a new battery

1. Clean the seat from glue residues with alcohol.

2. glue a new battery (use double-sided tape or B7000 glue if the battery does not have adhesive base).

3. Connect the plume to the connector and lock it.

Step 7: Assembly of the phone

1. Install a metal plate and twist the screws (do not tug!).

2. Press the back cover, starting with the power and volume buttons.

3. Warm up the edges with a hairdryer for better fixation.

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After replacing the battery, be sure to calibrate the battery: completely discharge the phone, then charge to 100% without interruption. Repeat the process 2-3 times to accurately display the charge level.

Frequent Mistakes and How to Avoid Them

Even with a careful disassembly, you can make mistakes that will cause your phone to fail.

• 🔌 Battery plume damage: Never pull wires - only take on a plastic connector.
• 🔧 Twisted screws: in Redmi 9A They're small and they're easy to break.
• 🔥 Use of inappropriate glue: Superglue or moment can damage the battery. B7000 double-scotch.
• 📵 Incorrect installation of metal plate: if it touches the contacts of the battery, the phone will not turn on.

If the Redmi 9A is not activated after assembly:

1. Check if the battery plume is connected.
2. Make sure all screws are in place (especially under the hood) SIM-tray).
3. Connect charging – sometimes the phone “wakes up” only after the power is supplied.

⚠️ Warning: If the battery runs out faster than before after replacing it, check its capacity in the AccuBattery app.

Calibration and testing of the new battery

Replacing the battery is only half the battle, and to make the new battery work properly, it needs to be calibrated and tested.

1. First charge: charge your phone to 100% original charger (5V/2A).
2. Full discharge: Use the phone before you turn it off automatically. Don't turn it on until you plug in the charger.
3. Recharge: charge again to 100% and discharge. Recycle 2 to 3 times.

To check the actual capacity, install the CPU-Z or AccuBattery application:

• 📊 V CPU-Z Go to Battery section – it displays the current capacity in mAh.
• 🔋 In AccuBattery, check the discharge schedule and battery health assessment (Health).

The following are the normal results for the new Redmi 9A battery:

• Capacity: 4800-5200 mAh (including losses).
• Voltage: 4.3-4.4 V when fully charged.
• Temperature: No higher than 40°C with heavy use.

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If the new battery is warmer than the old one, make sure there is no protective film left under it, and make sure that the metal plate does not touch the contacts of the battery.

FAQ: Answers to Frequent Questions