Xiaomi Mi 8 Lite is a popular smartphone of 2018, which is still actively used due to the balanced characteristics and affordable price. However, over time, even the most reliable batteries lose capacity: the phone starts to run out in a few hours, turns off at 20-30% charge or refuses to turn on without charging. If you encounter these problems, replacing the battery will be the best solution.
In this article, we will discuss how to replace the battery with Xiaomi Mi 8 Lite with your own hands, from choosing a new battery to the final assembly of the device. You will learn what tools you need, how to avoid typical errors and prolong the life of a new battery.
Signs of battery failure on Xiaomi Mi 8 Lite
Before you start replacing, make sure that the battery is the problem, and here are the key symptoms that signal the need to replace:
- 🔋 Phone's running out of power. 2-3 hours with moderate use (social networks, messengers, calls).
- 📉 The percentage of charge "jumps": for example, with 40% drops 15% or the phone is turned off when 20-30%.
- 🔌 The device does not turn on without connecting to the charger, even if the indicator shows a residual charge.
- 🔥 The battery is swollen (seen over the raised back cover or the increased gap between the screen and the case).
- ⚡ The phone heats up strongly during charging or operation, even without loading.
If you see at least 2-3 signs on the list, the battery is probably worn out, and you can check its condition using applications like AccuBattery or AIDA64. They will show the real capacity of the battery and the number of charging cycles. For the Mi 8 Lite, a critical drop in capacity below 70% of nominal value (the original battery is 3350 mAh).
⚠️ Warning: If the battery is swelling, don't delay replacement! The risk of damage to internal components (such as the motherboard) or even fire increases with each passing day.
What battery to choose for Xiaomi Mi 8 Lite?
The battery quality is not only the life of the phone, but also the safety of the phone, and there are three options on the market:
| Type of battery | Pluses | Cons | Price (2026) |
|---|---|---|---|
| Original (Xiaomi) | Guaranteed quality, full compatibility, long service life. | High price, difficult to find on sale (removed from production). | 2500–3500 ₽ |
| Premium class analogue (e.g. Camelion, Patona) | Good quality, close to the original characteristics, more accessible. | You may get fakes, the service life is slightly less than the original. | 1200–2000 ₽ |
| Budgetary analogue (no-name) | Low price, easy to buy. | Risk of bloating, low real capacity, short life. | 500–1000 ₽ |
We recommend choosing batteries with a real capacity of at least 3200 mAh (the original is 3350 mAh).
- 🔍 Marking: Must match the original — BM4H or BM4J (Mi 8 Lite).
- 📦 Package: the set must have adhesive strips to fix the battery.
- 🛡️ Guarantee: Reliable sellers give a minimum of 6 months.
Where to buy? Best options:
- 🛒 Xiaomi’s official service centers (if you find the original).
- 🌍 Verified online stores: AliExpress (sellers rated 98%+), Beru, Wildberries.
- 🔧 Local phone parts stores (ask for quality certificates).
💡
Check the reviews of the seller before you buy! Often, understated counterfeit batteries are sold understated, and pay attention to real-life photos and video reviews.
Preparing for replacement: tools and safety
To replace the battery with Xiaomi Mi 8 Lite, you will need:
Screwdriver cross (PH00 or PH0)
Plastic mediator or blade for opening the body
Screen suction cup (optional, but simplifies the process)
Thin-ended tweezers
Dryer or thermo-air station (for softening the glue)
New battery with adhesive stripes
Isopropyl alcohol (90%+) for cleaning contacts
Gloves and safety glasses (recommended)-->
Also prepare the workplace:
- 🪑 Work at a table with good lighting.
- 🧲 Remove metal objects (they can magnetize to the screwdriver and damage the board).
- 📱 Turn off the phone and remove it. SIM-map + memory card (if any).
- 🔋 Charge the new battery before 30-50% before installation (it is safer).
⚠️ Warning: If you've never disassembled your phones, practice on an old device or watch the Mi 8 Lite video disassembly on YouTube.Orrors in opening the case can damage the screen plumes or buttons!
Critical detail: in the Xiaomi Mi 8 Lite, the battery is glued to the body, rather than being fixed with latches, as in some models, which complicates the process - you will need to carefully separate it without damaging it.
Step-by-step instructions for replacing the battery
Follow the instructions carefully. If you skip the step, you risk damaging your phone!
Step 1: Removing the back cover
1. Heat the back end edge with a hair dryer (~60°C) for 1-2 minutes. This will soften the glue.
2. Insert a plastic mediator into the gap between the lid and the housing (start at the bottom edge where the charging connector is).
3. Carefully guide the mediator around the perimeter, separating the lid. Don't force it, if it doesn't, warm it up again.
4. Remove the lid and put it aside. Be careful that it has a fingerprint scanner glued to it (if your model has one).
Step 2: Disconnect the old battery
1 Unscrew 10 screws that fix the metal plate above the battery (use the PH00 screwdriver).
2 Take the plate off carefully and put it down. Under it you'll see the battery plume.
3. Unplug the plume with a plastic spatula. Don't pull the wires!
4. Check disconnect: try turning the phone on (it should not respond).
Step 3: Remove the old battery
1. Put a plastic blade on the battery from any end, and if it doesn't respond, warm it up with a hair dryer (maximum 70°C!).
2. Pull slowly, putting on the adhesive strips. If they break, use tweezers.
3. Remove the glue residue from the case with isopropyl alcohol. Do not use acetone or solvents!
Step 4: Installation of a new battery
1. Remove the protective film from the adhesive strips on the new battery.
2. Carefully set the battery in place, press it for 10-15 seconds to fix.
3. Connect the battery plume to the motherboard. Make sure the contacts match!
Step 5: Assembly of the phone
1. Set the metal plate in place and twist all 10 screws.
2. Return the back cover, press it around the edges. Warm up with a hair dryer (50°C) for better glue fixation.
3. Turn on the phone and check the charge: if done correctly, it will show 30-50% (depending on the battery pre-charge).
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Don't turn on the phone if the battery isn't fixed! this can short circuit and damage the motherboard.
Frequent Mistakes and How to Avoid Them
Even experienced wizards sometimes make mistakes, and here are the most common problems when replacing the battery with the Xiaomi Mi 8 Lite and how to prevent them:
- 🔌 Battery plume damage: never pull the wires! Unplug the connector with a plastic blade only, putting it on the sides.
- 🔥 Overheating of the battery with a hairdryer: maximum temperature - 70°C. Use a thermometer or keep a hair dryer at a distance of 10 cm.
- 🛠️ Loss of screws: fold them in a magnetic bowl or on a sticky tape. Rotors of different sizes - don't confuse them!
- 📱 Screen damage: don't press the display when you remove the lid. If it doesn't, warm up more.
- 🔋 Incorrect battery fixation: If the adhesive strips are weak, use double-sided scotch 3M 467.
If the phone is not switched on after replacement:
- Check if the battery plume is connected.
- Make sure your contacts are not contaminated (wipe with alcohol).
- Connect the charge for 10-15 minutes – sometimes a new battery needs a wake-up.
- If it doesn’t help, check the fuse on the motherboard (a multimeter is required).
What if the phone is rebooted cyclically after replacing the battery?
How much does it cost to replace the battery in the service?
If you are not sure of your abilities, it is better to contact the professionals.The cost of replacing the battery with the Xiaomi Mi 8 Lite in 2026:
| Type of service | Cost of work | Cost of battery cost | Totally. | Term |
|---|---|---|---|---|
| Official Xiaomi service | 1500–2500 ₽ | 2500–3500 ₽ (original) | 4000–6000 ₽ | 1-3 days |
| Unofficial service (with guarantee) | 800–1500 ₽ | 1200–2000 ₽ (analogue) | 2000–3500 ₽ | 1-2 hours |
| Self-sustaining replacement | — | 500–2000 ₽ | 500–2000 ₽ | 30–60 minutes |
When choosing a service, pay attention to:
- 📄 Guarantee: minimum 3 months for work and 6 months for battery.
- 🔧 Reviews: check Yandex.Maps, 2GIS or local forums.
- 💬 Diagnostics: A good technician will first check the phone and tell you the exact cause of the problem.
If the phone is important for work or data storage, it is better not to take risks. Unscrupulous workshops can install a poor-quality battery or damage the fee.
How to extend the life of a new battery?
To make your new battery last longer, follow these tips:
- 🔋 Avoid full discharge: charge your phone when 15-20% charge.
- ⚡ Don't use fast charging all the time, it speeds up wear. 5W-10W.
- 🌡️ Watch the temperature: Do not leave your phone in the sun or near heat sources.
- 📵 Disable unnecessary functions: GPS, Bluetooth, mobile data in the background drains the battery.
- 🔄 Calibrate the battery: once in a while 2-3 Unload your phone for a month. 0% and load up 100% breaklessly.
It is also useful to turn off the background activity of applications:
- Go to Settings → Applications → Permissions → Autorun.
- Turn off auto-start for unnecessary applications.
- In Settings → Battery and Performance → Battery Consumption Management, select Energy Saving mode for background applications.
The average battery life, if properly operated, is 2-3 years, and if the capacity drops to 80 percent, you can repeat the replacement.