Xiaomi Redmi 7, released in 2019, is still a popular budget smartphone — but its battery capacity of 4000 mAh after 3-4 years of operation often requires replacement. In this article, we will analyze the current prices for battery replacement in 2026, compare the cost in service centers and self-repair, and also tell you how to distinguish the original battery from counterfeit and avoid typical errors.
Average life of lithium-ion batteries — 2-3 year of active use, if your Redmi 7 It quickly discharging, spontaneously turning off when 20-30% If you're charging or swelling up (as you can see from the screen up), it's time to think about replacing it. But how much will it cost? 7 (model BM47) starting 800₽, A full replacement in the service will cost 1500-3500₽ Depending on the region and type of workshop.
It's important to understand that saving on battery quality can lead to damage to the board or even fire — cheap counterparts often do not have protection against overheating. In this article, we collected proven purchase options, prices in different cities and step-by-step instructions for those who decide to replace with their own hands.
How much does the original battery for the Redmi 7 cost?
The original battery for Xiaomi Redmi 7 has an BM47 article (or MBJ407450 in some directories) and a capacity of 4000 mAh. It can be purchased separately, it will cost less than a replacement in the service. Here are the current prices for 2026:
- 🛒 Official Xiaomi Stores (Mi Store, Mi.com): 1200-1500₽ — Guarantee of originality, but often interruptions with supplies.
- 🌍 AliExpress (Verified Sellers): 800-1200₽ — risk of getting into a fake, but there are reviews and ratings.
- 🏬 Local parts stores (for example, "Fix-Price", "Chip and Deep"): 900-1400₽ — You can check the battery before buying.
- 🔧 Service centers (sales without installation): 1000-1300₽ — Sometimes it is cheaper than buying it yourself.
On AliExpress, pay attention to sellers with a rating above 98% and orders from 1000+.
- 🔋 Capacity: 4,000 mAh (not 3800 or 4200!).
- 📌 Articulum: BM47 or MBJ407450.
- 🔍 The presence of a hologram and QR-packet-code.
- 📦 Component: battery itself + shield-film.
⚠️ Attention: If the price is lower 700₽ — it 100% These batteries can have real capacity. 2000-2500 max and swell through 2-3 month.
Cost of battery replacement in service centers
The replacement price in the service includes the cost of the battery + the work of the master. In official Xiaomi centers, only original parts are used, but the price is higher there.
| Type of service | Cost (₽) | Guarantee | Pluses | Cons |
|---|---|---|---|---|
| Official Xiaomi service | 2800-3500 | 6-12 months | Original parts, phone check | Long (3-7 days), expensive |
| Authorized partner | 2200-3000 | 3-6 months | Faster (1-2 days), cheaper than official | A non-original battery may be used. |
| Local repairs (non-network) | 1500-2500 | 1-3 months | Low price, promptly (1-2 hours) | Risk of counterfeiting, no warranty on the phone |
| Self-sustaining replacement | 800-1500 (battery only) | No. | Maximum savings | Risk of damaging plumes or display |
Prices may vary in regions 10-20%. In Moscow and St. Petersburg, the replacement in the official service will cost in the 3200-3500₽, a — 2500-2800₽. Please clarify before your visit:
- 🔧 Do they use the original battery (ask the article) BM47).
- ⏳ Term of execution (in official centers may be a queue for the 1-2 weekdays).
- 📋 Whether you have a job guarantee (should be at least 3 months).
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Before replacing, back up your data! In rare cases, when the battery is turned off, IMEI may be reset or firmware damaged. Use Settings → System → Backup or Mi PC Suite.
How to check if the battery is original
The fake batteries for the Redmi 7 are almost indistinguishable from the original ones, but there are several ways to check:
- Packaging: Original has hologram with Xiaomi logo, QR-code (can be scanned) and hard-printed, error-free, counterfeits are often sold in unmarked plastic bags.
- Battery inscriptions: Must be clear, without blurring. Original is marked: Xiaomi BM47 4000mAh 3.85V Made in China On fakes may be indicated 4200mAh or missing the article.
- Weight: The original battery weighs ~45 grams and counterfeiting is often lighter (35-40 g) because of its smaller capacity.
- Check after installation: Enter the code ##4636## in the engineering menu, select Battery Information. The original will show the actual capacity (~3800-4000 mAh), the fake will show the overestimated capacity (5000-6000 mAh).
If you buy a battery on AliExpress, be sure to check the reviews with photos. For example, the seller of the Xiaomi Original Battery Store (ID 12345678) has a lot of positive reviews about batteries for the Redmi 7.
⚠️ Warning: If the phone starts to warm up or discharge quickly after replacing, immediately remove the battery! This is a sign of a faulty charge controller - further use is dangerous.
What happens if you install a larger battery (e.g., 5000 mAh)?
Self-replacement: step-by-step instructions
If you want to change the battery, prepare:
- 🔧 Set of screwdrivers (cross, flat, flat, T3-T5 plume).
- 🔥 Hair dryer or plastic blade to unstick the battery.
- 🧲 Screen removal suction cup (optional).
- 🔋 New battery (proven!).
- 📦 Clay. B-7000 or double-sided tape for fixation.
Step-by-step process:
- Turn off the phone and remove it. SIM-map.
- Heat the back cover with a hair dryer (1-2 minutes) and gently tuck it in with a plastic spatula. Be careful - the fingerprint plume is glued to the lid!
- Unscrew 10 screws (marked in the photo below) and disconnect the battery plumes and display.
- Put a plastic blade on the battery (not a metal blade!) and peel it off carefully. If it's swelling, don't puncture it!
- Install a new battery, plug in the plumes and assemble the phone in reverse order.
☑️ Checklist before replacing the battery
The hardest part is unplugging the old battery, and if it's swelling, you better not take the risk and go to the service, and be careful with the plume of the display, it's easy to damage!
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If you are not sure about your skills, it is better to pay too much. 500-1000₽ for replacement in the service, than to risk damaging the motherboard (repair will cost in the 5000-8000₽).
Where to change the battery: comparison of options
To save money, compare a few options:
- 🏠 Self-sustaining replacement: 800-1500₽ (battery) + This is the risk of damaging your phone, if you have experience in electronics repair.
- 👨🔧 Local workshop: 1500-2500₽ — Best option for the ratio of price / quality. Look for workshops with reviews on Yandex.Maps or 2GIS.
- 🏢 Official service: 2800-3500₽ — It's expensive, but it's reliable, if you have a warranty phone (although the battery is a consumable and it's usually guaranteed). 6 months).
- 📦 Mail/courier: Some services (for example, "Repair Xiaomi") offer the wizard to go home for a visit to the house. 2000-2800₽. Convenient, but check the reviews.
For maximum savings, you can buy a battery on AliExpress (800-1200₽) And take her to the workshop where they only take her for work (500-800₽). Totally: 1300-2000₽ instead 2500-3500₽.
When choosing a service, pay attention to:
- 📝 Contractual status (even if it is a small workshop).
- 🔧 Tools used (should be antistatic mats, professional screwdrivers).
- 🕒 Guarantee period (less than 3 months – a reason to be wary).
Frequent Replacement Mistakes and How to Avoid Them
Even experienced users sometimes make mistakes that cause their phones to break down.
- Use metal tools to peel off the battery. → Risk: short circuit, battery puncture (fire!). → Solution: use only plastic blades or special devices.
- Not turning off the battery plume before work. → Risk: combustion of the power controller. → Solution: first of all, disconnect the battery connector (it is usually black).
- Strong heat of the battery with a hairdryer. → Risk: bloating or even ignition. → Solution: heat no more than 1-2 minutes at minimum power, keep the hairdryer at a distance of 10 cm.
- Installation of the battery without fixing. → Risk: shifting the battery when falling, breaking the plume. → Solution: use B-7000 glue or double-sided tape.
- Buying a battery without checking. → Risk: fake with a capacity of 2000 mAh instead of 4000. → Solution: check the weight, labeling and reviews before buying.
If the phone does not turn on after replacement, check:
- Is the battery plume connected (sometimes it flies off when assembled).
- Have you damaged the display plume or power button?
- Whether the back cover is properly installed (if it does not fit tightly, the phone may not turn on).
⚠️ Note: If the battery is discharged after replacement 2-3 You probably installed a fake or damaged the charge controller, which means you need a diagnostic on the service.