Replacing the battery on Xiaomi Redmi Note 10S: a complete guide with nuances

Redmi Note 10S - one of the most popular smartphones Xiaomi middle class, but even its reliable battery capacity 5000 mAh Loses capacity over time. If your phone runs out of charge in half a day, turns off at 30-40% charge, or the case is swollen, it’s time to think about replacing the battery. In this article we will look at how to do this. no errorswithout damaging the smartphone or voiding the warranty (if it is still valid).

Replacing the battery yourself Redmi Note 10S It seems simple: unscrew the screws, remove the cover, change the battery. But in practice there is 3 critical moments, which are silent in 90% of instructions: the correct choice of battery (original vs analogue), processing of the adhesive layer and calibration of the power controller after installation. We will analyze each stage in detail - from diagnostics to testing a new battery.

How to understand that the battery Redmi Note 10S needs replacement?

The first sign of battery wear is fast discharge. If a smartphone used to hold a charge for a day, but now it barely lasts until the evening, this is not a reason to panic. First check background processes in Settings → Battery and turn off power-hungry applications. But there is 5 clear symptoms, which indicate the need for replacement:

• 🔋 The phone turns off when 20–40% charge and does not turn on without recharging.
• 🔥 The body is swollen (especially noticeable in the camera area or on the side).
• ⚡ Charging occurs in spurts: it either quickly gains interest, or “freezes” at the same level.
• 📉 B Settings → Battery status shows wear more than 30%.
• 🔌 The smartphone overheats when charging or working (even without load).

If at least two items from the list match - battery Redmi Note 10S worn out. For accurate diagnosis, use apps like AccuBattery (shows actual capacity) or AIDA64 (power controller tests). Please note: if the phone swollen, it is dangerous to operate - there is a risk of fire or damage to the display!

⚠️ Attention: If the battery is swollen, do not try to puncture or squeeze it! This may cause a fire. Immediately turn off your smartphone and proceed with replacement.

Which battery to choose for Redmi Note 10S: original or analogue?

Original battery for Redmi Note 10S has an article number MB-J21 (or MB-J21M for global version) and capacity 5000 mAh. Its advantages: full compatibility with the power controller, stable operation and long service life. However, the original batteries from Xiaomi They are expensive (from 2000 to 3500 rubles), and they are often counterfeited. An alternative is high-quality analogues from trusted brands.

Battery type	Brand/Model	Capacity	Average price	Pros	Cons
Original	Xiaomi MB-J21	5000 mAh	2500–3500 ₽	100% compatible, long service life	Expensive, many fakes
Analogue premium	Patona P5000	5000 mAh	1800–2200 ₽	High quality items, good reviews	May require calibration
Budget analogue	Baseus B5000	5000 mAh	1200–1500 ₽	Low price, easy installation	Loses capacity faster, possible problems with charging
Increased capacity	Remax R5500	5500 mAh	2500–3000 ₽	Works longer without recharging	May display percentages incorrectly, risk of overheating

When choosing an analogue, pay attention to standard size (must be the same as the original: 152 × 73 × 3.5 mm) and voltage (3.85 V). Cheap batteries without markings often have a lower actual capacity (for example, instead of 5000 mAh - 4000–4500). Check reviews on sites like AliExpress or Yandex Market, where customers share test results.

Preparing for replacement: tools and safety precautions

To replace the battery with Redmi Note 10S you will need:

• 🔧 Screwdriver set: cross (PH00) And five-beam (Security Torx T5) for the screws near the SIM tray.
• 🧲 Suction cup for removing the display (or a thin plastic spatula).
• 🔥 Hair dryer or hot air station (to soften the glue).
• 🧴 Isopropyl alcohol (90%+) for cleaning contacts.
• 🛡️ Gloves and safety glasses (battery contains lithium!).

Important: before starting work turn it off completely phone and wait until it cools down (if recently used). Work for flat, clean surface no carpets or fabrics that can cause static electricity. If you don't have experience disassembling electronics, practice on an old smartphone or watch video showdown.

⚠️ Attention: Do not use metal prying tools to pry up the battery - they may puncture the battery! Only plastic or wooden tools.

Make a backup copy of your data (in case of a factory reset)|Charge your phone to 30-50% (so that the battery is not completely drained)|Prepare your work area (good lighting, no dust)|Check that you have all the tools|Remove the case and SIM card-->

Step-by-step instructions: how to remove the old battery

Disassembly Redmi Note 10S It starts with removing the back cover. Unlike flagships, here it is not glued with sealant, but is held on clips and double-sided tape. Be careful not to break the latches:

1. Heat the edges of the back cover with a hairdryer (temperature 60–70°C) for 1–2 minutes. This will soften the glue.

2. Use a plastic spatula or suction cup to pry the cover off the charging connector. Do not use force, otherwise the camera glass will crack!

3. Carefully remove the cover, moving around the perimeter. If it does not give in, warm up the problem areas again.

4. Unscrew 11 screws (9 cross and 2 five-point near the SIM tray) and remove the metal plate.

5. Disconnect the battery, display and motherboard cables. Use plastic tweezers to avoid damaging the contacts.

Now you need to remove the old battery. It is glued to the body, and the main thing here is not to rush. Use a plastic spudger to pry the battery from the side and slowly pull it up. If it does not come off, warm it up with a hairdryer (no higher than 80°C!). Do not use sharp objects - risk of puncture!

What to do if the battery is glued too tightly?

If the battery does not come off even after heating, try dripping isopropyl alcohol under the edge - it dissolves the glue. Alternative: a thin guitar string (0.1–0.2 mm), which can be used to “saw” the adhesive layer by prying off the battery.

After removal, inspect the case for corrosion or damage. Clean the contacts with alcohol and check for any swollen capacitors on the board (this could indicate a power problem).

Installing a new battery and assembling the phone

Before installing a new battery, compare it with the original: they must match dimensions, location of contacts and cable. If you bought an analogue, check the voltage with a multimeter (should be 3.7–3.85 V). Installation proceeds in reverse order:

1. Attach the new battery with double-sided tape (included) or use original glue (for example, B7000).

2. Connect the battery cable to the motherboard. Make sure the contacts are not bent.

3. Secure the metal plate and tighten all the screws (do not overtighten!).

4. Install the back cover starting from the top (near the camera). Press down the clips around the perimeter.

After assembly, do not turn on the phone immediately! First connect it to the charger on 15–20 minutesso that the new battery “awakens”. Then do calibration:

• 🔌 Charge your phone to 100% and keep it on charge for another 1 hour.
• 📵 Turn off charging and discharge to automatic shutdown.
• 🔄 Repeat the cycle 2-3 times.

This will help the power controller correctly determine the capacity of the new battery. If after replacement the phone shows an incorrect charge percentage, reset the settings via Settings → System → Reset settings → Reset battery settings (if such item exists).

Common mistakes and how to avoid them

Even with careful replacement, mistakes can be made that will lead to rapid wear of the new battery or phone problems. Here are the most common mistakes and ways to prevent them:

• 🔧 Overtightened screws → use a screwdriver with a torque limiter or tighten by hand without force.
• 🔌 Damaged battery cable → before connecting, check whether the contacts are bent.
• 📉 Incorrect calibration → do not interrupt the first charge/discharge cycle.
• 🔥 Overheating when soldering → if you have to solder contacts, use a soldering iron with a power of no more than 30 W.

Another typical problem is The phone does not turn on after assembly. The reasons may be different:

• The display or battery cable is not connected (check the contact tightness).
• Short circuit (inspect the board for foreign objects).
• The controller protection has tripped (wait 10–15 minutes and try turning it on again).

If all else fails, connect your phone to your PC via USB and check if it is defined in Device Manager. If yes, the problem is in the display or cable. If not, the motherboard may be damaged.

How much does it cost to replace a battery at a service center?

If you are not confident in your abilities, it is better to contact a service center. Battery replacement cost Redmi Note 10S varies depending on region and battery type:

Service type	Cost of work	Battery cost	Total	Warranty
Official service Xiaomi	1500–2500 ₽	2000–3500 ₽ (original)	3500–6000 ₽	6–12 months
Unofficial service	800–1500 ₽	1200–2500 ₽ (analogue)	2000–4000 ₽	1–3 months
Self-replacement	0 ₽	1200–3500 ₽	1200–3500 ₽	Depends on battery

Official services Xiaomi They provide a guarantee on work and battery, but are more expensive. Unofficial workshops may offer a lower price, but the risk of running into a low-quality battery is higher. When choosing a service, check:

• 📋 Availability of reviews (especially on Yandex Maps or 2GIS).
• 🔧 Do they use original spare parts (ask for certificates).
• 📅 Warranty period (less than 3 months - a reason to be wary).

If you decide to change the battery yourself, keep the receipt for the purchase of the battery - some stores even provide a guarantee for self-installation.

FAQ: answers to frequently asked questions

Is it possible to replace the battery with Redmi Note 10S without disassembling the phone?

No, that's impossible. Battery in Redmi Note 10S is soldered into the case, and to replace it requires complete disassembly of the smartphone. Any “contactless” methods (for example, charging via an external power bank) are a temporary solution that will not eliminate the problem of battery wear.

What happens if you install a battery with a larger capacity (for example, 5500 mAh)?

Theoretically, the phone will last longer, but there are risks:

• The power controller may not display the charge percentage correctly.
• Heating will increase when charging (especially if you use fast charging 33 W).
• The battery may not fit into the case or may become deformed.

If you still decide to experiment, choose models with overheat protection and monitor your phone's temperature.

How can I check if the battery I was sold is original?

Original battery Xiaomi has:

• Clearly marked with the article number (MB-J21) and a hologram.
• Smooth seams and high-quality soldering of contacts.
• The inscription “Made in China” (not “Assembled in China”).
• Comes with double-sided tape 3M.

You can also check the serial number through the application Mi Check (available for service centers). Counterfeits often have typos in markings or uneven coloring.

How long will a new battery last?

The service life depends on the battery type and operating conditions:

• Original: 2–3 years (500–800 charge cycles).
• High-quality analogue: 1.5–2 years (400–600 cycles).
• Budget analogue: 6–12 months (200–300 cycles).

To extend battery life:

• Avoid full discharge (optimally keep the charge at 20–80%).
• Do not use cheap chargers (especially those without support Quick Charge).
• Don't leave your phone charging overnight.

Is it possible to restore an old battery?

Partially yes. If the battery is not swollen, try:

1. Calibration: Completely discharge and charge your phone 3 times in a row.

2. Cleaning contacts: Wipe the contacts of the battery and the board with alcohol.

3. Replacing the controller (if the problem is in it, and not in the battery elements).

But these measures are temporary. If the capacity has dropped below 60% of the nominal value, restoration is pointless - a replacement is needed.