Xiaomi Redmi 9 was released in 2020, but still remains a popular budget device. However, after 3-4 years of active use, even the highest-quality battery loses up to 30-40% of capacity: the phone discharges in half a day, turns off at 20-30% charge or refuses to turn on without connecting to charging. If you encounter these problems, it is time to think about replacing the battery.
In this article, we will look at the current prices for replacing the Redmi 9 battery in 2026, from official service centers to private workshops and self-repairs. You will learn how much an original and unoriginal battery costs, where to change it (so as not to run into fraud), and how to save up to 50% without loss of quality.
Original vs. Non-Original Battery: What’s the Difference and Should You Overpay?
The first question that arises when replacing a battery is which battery to choose. Original parts from Xiaomi cost more, but guarantee compatibility and long life. Non-original (analogues) are cheaper, but their quality can vary greatly.
The main differences:
- 🔋 Capacity: Original — 5020 Mach (like the new Redmi) 9), analogues often have 4500–4800 mAh, which reduces the time of work by 10-20%.
- 🔄 Number of charging cycles: The original holds 500+ cycles, cheap analogs — 200-300.
- 🛡️ Overheating protection: Original batteries have thermal sensors that prevent bloating.
- ⚡ Charging speed: Poor-quality batteries may not support Quick Charge 3.0, making the phone charge longer.
According to tests from iFixit, cheap analogues lose up to 50% of their capacity after 6-8 months of active use, while the original batteries last 1.5-2 years, but the difference in price can reach 3-4 times - more about this in the next section.
Redmi 9 battery replacement prices in 2026: a comparison table
The cost of replacement depends on three factors: battery type, repair site and complexity of work. Below is the current price list for Moscow, St. Petersburg and the regions (prices can vary by ±10-15% depending on the dollar exchange rate and logistics).
| Type of battery | Official Xiaomi service | Authorized partner | Private workshop | Self-sustaining replacement |
|---|---|---|---|---|
| Original (5020 mAh) | 3 500 – 4 200 ₽ | 2 800 – 3 500 ₽ | 2 200 – 3 000 ₽ | 1 800 – 2 500 ₽* |
| Quality analogue (4800-5000 mAh) | — | 1 800 – 2 500 ₽ | 1 200 – 2 000 ₽ | 800 – 1 500 ₽* |
| Budget analogue (4500 mAh) | — | — | 700 – 1 200 ₽ | 500 – 900 ₽* |
* Price only for the battery without taking into account tools (with self-replacement, solder, glue, mediator will be required).
Xiaomi’s official services only have original batteries, but their price includes diagnostics (300-500 ₽) Private workshops often save on glue or sealants, which can lead to dust getting inside the case.
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Before replacing, ask the wizard to show the battery packed with the label.The original Xiaomi battery has a hologram, serial number and the inscription Made in China (not Assembled!).
Where to change the battery: pros and cons of different options
The choice of the repair site depends on your budget, warranty period and willingness to take risks.
1. Official Xiaomi Service Center
Pros:
- ✅ Guarantee 6-12 months at work and part.
- ✅ Original components with authenticity check.
- ✅ Diagnostics of other nodes (free or for a nominal fee).
Cons:
- ❌ Highest price (for the price) 30-50% more expensive than in the workshops).
- ❌ Lines for repairs (term to 5-7 days).
- ❌ Denial of warranty if the phone has been repaired unofficially.
2 Authorized Partners (Services with Xiaomi License)
These are workshops that have been certified by Xiaomi, but are not official centers, prices are lower by 20-30%, and the warranty is 3-6 months, the risk of running into a fake is minimal, but it is better to specify which batteries are installed.
3. Private workshops and repair points
The most budgetary option, but also the most risky one, and you can save up to 50 percent, but you can:
- ⚠️ Batteries of unknown brands are often installed (for example, NoName or Generic).
- ⚠️ No guarantee for work – if the battery rises in a month, you will be denied free repairs.
- ⚠️ Risk of damage to the plume or motherboard in a careless opening.
4. Self-substitution
If you have experience in electronics repair, you can replace the battery yourself. Pros: savings of up to 60%, quality control of spare parts. Cons: risk of damage to the case or display, loss of leakage (dust / moisture can penetrate inside).
How to check the workshop before repair?
Step-by-step: how to replace the battery on Redmi 9 yourself
If you're saving and changing your battery, follow this instruction. Attention: the process requires care and basic electronics skills. If you've never disassembled a smartphone, you'd better go to a wizard.
Tools required:
- 🔧 Plastic mediator or guitar mediator.
- 🔧 Cross screwdriver (size) PH00).
- 🔧 Suction cup for display removal (can be replaced with scotch).
- 🔧 Hair dryer or thermo-air station (for softening glue).
- 🔧 New battery with adhesive base.
- 🔧 Alcohol and wipes to clean contacts.
Step-by-step process:
- Turn off the phone and remove it. SIM-map.
- Heat the back cover with a hair dryer (60-70°C) for 2-3 minutes to soften the glue.
- Push the cover with a mediator, starting at the bottom edge (near the USB-C connector). Act carefully so as not to damage the plumes.
- Disconnect the battery from the motherboard by disconnecting the plume (it is fixed with a small connector).
- Remove the old battery by putting a plastic spatula on it. If it swells, don't puncture it!
- Install a new battery, plug in the plume and assemble the phone in reverse order.
✔ Purchased original or certified battery (not "no-name")
✔ Prepared the workplace (clean surface, good lighting)
✔ Checked that the tools do not conduct electricity (plastic / wood)
✔ I took pictures of the location of the plumes before the disassembly
✔ I disconnected my phone from the network and waited for full discharge (for security)
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Warnings:
⚠️ Warning: If the battery is swelling, don't try to remove it without protection! A bloated battery can ignite if punctured.
⚠️ Warning: When building, make sure all the plumes fit tightly to the connectors. Incorrect connection can lead to bootloop (locked on phone).
The hidden risks of cheap battery replacement: what are the unscrupulous workshops saving on?
Many of the workshops offer battery replacement for 500-800 ₽, But this low price should be a concern. Most of the savings come from the cost of the money:
1. Use of used batteries
Some "masters" buy old batteries at disassemblies (for example, from phones with broken screens) and pass them off as new. These batteries are already worn out and will last for 2-3 months. How to check: the new battery should be in the factory package with a hologram, and its capacity can be checked by AccuBattery (should show a value close to 5000 mAh).
Lack of sealing
After the battery is replaced, the case must be sealed or dust or moisture will get inside, and cheap workshops often use regular tape instead of special glue, which leads to:
- 🌫️ Contamination of the motherboard (the phone starts to overheat).
- 💧 Corrosion of contacts when moisture is injected (even if the phone does not sink).
- 📵 Loss of water protection (if it was originally used).
3. Damage to plumes
If you open the case in a careless manner, you can damage the plumes of the display, the camera or the power button, and as a result, after the battery is replaced, you can:
- 🖥️ Artifacts on screen (strips, flickering).
- 📸 Inoperable main or front camera.
- 🔘 Sticking buttons (volume, power).
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If after the battery change, the phone becomes worse (heat, turn off, brake), most likely, the master damaged the motherboard or installed a poor-quality battery.
How to extend the life of a new battery: 7 rules of charging
Even the original battery will last longer if you follow the simple rules of operation.
- Avoid full discharge. Optimal range is 20 to 80 percent. Regular discharges to 0% reduce lifespan by 30 percent.
- If the phone is hot (for example, after games), let it cool before connecting to charge.
- Use the original power supply. Cheap charging can cause unstable voltages that damage the battery.
- Turn off fast charging after 80%. Quick Charge speeds up battery wear. In Redmi 9 settings, you can turn off accelerated charging: Settings → Battery → Charging modes.
- Keep your phone at 40-60% charge if you don’t use it for long periods of time (e.g., while on vacation).
- Avoid wireless charging. Redmi 9 doesn't support Qi, but if you're using an adapter, remember: Induction charging heats the battery harder than wired charging.
- Calibrate the battery every 3 months. Completely discharge the phone, then charge to 100% without interruption.
Compliance with these rules can increase the battery life by 20-30%, for example, if the battery lasts an average of 2 years, then if used carefully, it will last 2.5-3 years.