How much is the battery on Xiaomi Redmi 9: prices 2026, where to buy and how not to make a mistake with the choice

Xiaomi Redmi 9

Redmi 9

2026?

Redmi owners 9 Often faced with the dilemma: buy a cheap analogue for the 500-800 rupees or original battery for 1500-2500 The difference in price is obvious, but what about quality? Xiaomi’s original batteries guarantee compatibility and long life, but they are hard to find in official stores. Analogs are cheaper, but they include low-quality fakes that can swell or fail in a couple of months, and we analyzed market offers, user reviews and expert tests to help you make informed choices.

In the article you will find:

• 📊 Current prices for original and analog batteries for Redmi 9 (updated June 2026).
• 🛒 Where to buy without the risk of running into a fake: proven shops and sites.
• ⚠️ Signs of counterfeiting – how to distinguish a quality battery from garbage.
• 🔧 Self-Replacement vs. Service Center: What is Cheaper and Safe.
• 🔋 Tips for extending the life of a new battery.

1. Battery prices for Xiaomi Redmi 9 in 2026: original vs. analogues

The cost of a battery for Redmi 9 varies depending on the type (original / analogue), capacity and place of purchase. Original batteries from Xiaomi are rare — they are produced in limited batches, and often under the guise of “original” sell high-quality analogues. Analogues are cheaper, but among them there are both decent options (for example, from Baseus or Remax) and outright marriage.

The following are the current prices for June 2026 (including shipping if you purchase online):

Important: Capacity above 5020 mAh (like Remax) is a marketing ploy. The actual capacity of such batteries rarely exceeds the original, and the Redmi 9 charging controller may not display interest correctly.

If you see a Redmi 9 battery that is less than 500 rubles, it’s almost certainly a fake. These batteries often have a capacity of 2-3 times lower than the stated one and can damage the smartphone.

2.Where to buy a battery for Redmi 9: checked stores and risks

The choice of the place of purchase is no less important than the choice of the battery itself. Xiaomi official service centers guarantee the originality of parts, but their prices are higher than the market by 20-30%. Marketplaces (Wildberries, Ozon, Yandex Market) offer a wide range, but among sellers there are scammers. AliExpress is cheaper, but delivery takes up to a month, and the warranty to return the goods is more difficult.

We recommend the following sites (taking into account the balance of price, quality and reliability):

• 🏢 Xiaomi’s official service centers are original details, but expensive (from 2000 onwards) ₽ work).

⚠️ Note: Avito and Yule often sell used batteries under the guise of new ones. Check the date of production (it is indicated on the original battery sticker) - if the battery is more than 2 years old, its capacity has already been reduced.

If you are buying on AliExpress, pay attention to:

• 📦 Number of orders – the more, the more reliable the seller.
• ⭐ Ratings are minimum 4.8/5.
• 📸 Photo/video reviews – real buyers often post battery tests.
• 🔄 Refund Terms – There must be a free refund within 15-30 days.

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Before you buy it, write to the seller, "Confirm that this is a new battery, not a used battery or a refurbished."

3. How to distinguish the original battery from a fake: 5 key signs

The fake batteries for the Redmi 9 are almost indistinguishable from the original ones, but there are a few parts that give out counterfeiting.

• 🏷️ The sticker is flat, with a clear font and hologram on the original. Counterfeiters often have blurry letters or low-quality glue.
• 🔢 Serial number must match the number on the box, it may not be on the fakes or it is duplicated.
• 🔋 Weight – The original battery weighs ~45–50 G counterfeiting is easier (30–40 g) due to smaller capacity.
• 🔌 Contacts are gold in color, smooth and scratchless. Counterfeiters often have dull metal.
• 📅 Production date – if the battery is more than 1-2 years old, its capacity has already been reduced (even if it is new).

Another way to test is by multimeter testing. The original Redmi 9 battery should give you a voltage of 3.8–4.4V If you're fully charged, if it's lower. 3.5V, Battery capacity is critically small.

⚠️ Warning: Some fakes mimic Xiaomi's original packaging, including holograms. check the battery by serial number on the website mi.com/verify (if there is a number).

If you are buying a battery from a service center, ask for:

1. Show the battery before installation (to make sure it is new).
2. Check the voltage with a multimeter.
3. Give a warranty card indicating the model of the battery.

4. Self-replacement of the battery: step-by-step instructions

You can replace the battery with a Redmi 9 yourself if you have experience disassembling smartphones. Difficulty: medium (you need to carefully disconnect the plumes and not damage the flexible cables). If you have never disassembled your phones, you better contact the service - an error can lead to a breakage of the display or motherboard.

What you need:

• 🔧 Set of screwdrivers (cross, flat, flat, T3, T5).
• 🧲 Screen suction cup.
• 🔥 A hair dryer or heating plate (to soften the glue).
• 🩹 Plastic mediators (for smearing the body).
• 🔋 New battery (proven!).
• 🧴 Alcohol or isopropyl alcohol (for cleaning contacts).

Step-by-step:

1. Turn off the phone and remove it. SIM-map.
2. Heat the back cover (at ~60°C) with a hair dryer for 1-2 minutes to soften the glue.
3. Carefully apply the lid to the plastic mediator starting at the bottom edge. Don't use metal tools - they scratch the body!
4. Unscrew 10 screws that fix the metal plate over the battery.
5. Disconnect the battery plume (it is glued, pull carefully!).
6. Put a plastic blade on the battery and remove it. If it's glued, use isopropyl alcohol to dissolve the glue.
7. Install a new battery, plug in the plume and assemble the phone in reverse order.

Charge your phone to 30-50% to avoid short circuits)|Make a backup copy of the data|Buy a high-quality glue to fix the new battery|Prepare the workplace (clean surface, good lighting)-->

⚠️ Warning: If you take out an old battery, it's swelling, don't puncture it! Bloated batteries can ignite. Better take the phone to a service where it's disassembled safely.

After replacement:

• 🔄 Calibrate the battery: completely discharge the phone, then charge to 100% without interruptions.
• 📊 Check the capacity in the engineering menu (#4636## → "Battery information").
• 🔌 Use only an original or certified power supply (e.g. Xiaomi) 18W).

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If the phone doesn't turn on after you've replaced it, check the battery plume connection and the contacts on the motherboard. A common mistake is that the connector is not fully inserted.

5. Replace in service vs. self: what is cheaper and safer?

The cost of replacing the battery in the service depends on the type of battery and region, and on average in Russia the prices are as follows:

When to contact the service:

• 🛠️ You have no experience in disassembling smartphones.
• 🔥 Battery swelled (risk of fire when self-extracting).
• 📱 Phone warranty (self-repair cancels it).
• ⚡ Urgent replacement is needed (in the service will be done in 1-2 hours).

When you can replace yourself:

• 💰 You want to save money (price difference is up to 2000). ₽).
• 🔧 You have the tools and experience of working with electronics.
• 🕒 Ready to spend 1-2 hours on a neat disassembly.

The hidden risks of self-replacement:

• 🔌 Damage to the display plume or motherboard (repair will cost 3000-5000) ₽).
• 🔥 Short circuit when the battery is connected incorrectly.
• 📵 Loss of watertightness (if the body is not properly sealed).

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If you decide to change the battery yourself, videotape the process, which will help you reassemble the phone if you forget the location of the parts.

6. How to prolong the life of a new battery: 7 rules

Even the original battery will not last long if you do not follow the rules of operation.

• 🔌 Charging "to the point" (100%) and discharging to zero.
• 🌡️ Overheating (playing heavy games while charging).
• 🔄 Use of non-original chargers.
• 📵 Keeping your phone discharged (for example, on a shelf without using it).

How to properly operate the battery:

1. 🔋 Keep the charge in the range of 20-80%. Full discharge and charge up to 100% reduce the lifespan.
2. 🌡️ Avoid overheating: Do not play games while charging, do not leave your phone in the sun.
3. 🔌 Use original or certified RAM (e.g. Xiaomi) 18W/20W).
4. 📴 Disable background apps that consume charge (check in Settings) → Battery).
5. 🔄 Calibrate once every 2-3 months: completely discharge and charge the phone.
6. 📵 If you don’t use your phone for long, keep it with a charge of 40-50%.
7. 🔋 Update the firmware - in new versions MIUI Optimized energy consumption.

Myths about batteries that you should not believe:

• ❌ "You need to completely discharge the phone once a month, this was true for nickel batteries, not for lithium polymers.
• ❌ "Charging at night spoils the battery — modern smartphones automatically turn off power at 100%.
• ❌ "Fast charging kills battery – Redmi 9 supports 18W, It is safe to use the original smog.

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The optimal temperature for the battery is 10-35°C. At 0°C capacity temporarily falls, and at 40°C+ degradation.

7. Frequent problems after battery replacement and their solution

Even if you have a good battery, you can have problems, and let's look at the most common ones and how to fix them.

Problem 1: The phone doesn’t turn on after being replaced.

• 🔌 Check the connection of the battery plume (it may not be fully inserted).
• 🔋 Try charging your phone for 10-15 minutes – sometimes the new battery is discharged to zero.
• 🔧 If it does not help - perhaps damaged motherboard (needs diagnosis in the service).

Problem 2: Quick discharge after replacement.

• 📊 Calibrate: Fully discharge and charge your phone 2-3 times.
• 🔍 Check the capacity in the engineering menu (#4636##) If it is less than 4500 mAh, the battery is defective.
• 📵 Close the background apps (especially Facebook, Instagram, instant messengers).

Problem 3: The phone is turned off by 20 to 30% of the charge.

• 🔋 It's a sign of malcalibration. Discharge the phone to zero, then charge to 100% without interruption.
• 🔧 If it doesn’t help, it may be a damaged power controller (repair needed).

Problem 4: The battery warms up when charging.

• 🌡️ Use the original RAM – non-original power supplies can give unstable voltage.
• 📵 Close all applications while charging.
• 🔋 If it warms even with the original ZU - the battery is defective (take to the service).

⚠️ Warning: If the battery swells in 1-2 months after the replacement, it is a sign of a fake or factory defect.

FAQ: Answers to Frequent Questions