Which battery to choose for Xiaomi Mi9: original or analogue?

Xiaomi Mi9

Mi9

But how do you choose the right battery to avoid getting a fake or a bad one? In this article, we'll go through the specifications of the original battery, list the proven ones, tell you how to tell the difference between a fake, and give you step-by-step instructions for replacing it. And also share the secrets to extend the life of a new battery.

Should you buy the original battery from Xiaomi, or can you save on a quality battery? What capacity should the battery be, and what parameters are critical for safety? The answers to these and other questions are below.

Technical characteristics of the original battery Xiaomi Mi9

The original battery for the Xiaomi Mi9 has the following options that are important to consider when choosing a replacement:

• 🔋 Capacity: 3300 mAh (milliamp-hours) This is a nominal value, the actual capacity may vary slightly.
• 🔌 Nominal voltage: 3.85 V (typical for lithium polymer batteries).
• 📏 Dimensions: approximately 73.5 × 72.5 × 4.5 The exact dimensions may vary within ±0.5 mm.
• 🔗 Type of connector: standard JST 1.0 (2 power contacts) + thermistor).
• 🔄 Number of charging cycles: up to 500 full cycles when used correctly.

Important: The original battery is labeled BM46 or BM47 (depending on the batch), which are often forged, so check not only the labels, but also the build quality, weight (the original weighs about 45-48 g) and the protective film with the hologram.

Also, pay attention to the charge controller. The Mi9 uses a Qualcomm Quick Charge 4+ chip that supports fast charging up to 27 watts. Poor-quality counterparts may not cope with high currents, which will lead to overheating or even fire.

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If you buy a battery from hand or on the market, ask the seller to check it with a multimeter.The voltage at the terminals should be between 3.7 and 4.2 V. If less than 3.5 V, the battery is deeply discharged and may not hold the charge.

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The main question when choosing a battery is to take the original or save on the analogue, let's take a look at the pros and cons of each option.

The original Xiaomi battery:

• ❌ High price – from 2500 to 4000 rubles depending on the seller.

Quality analogues (e.g. from ZMI, Baseus, Patona):

If you choose a similar, prefer proven brands with good reviews. For example, ZMI batteries (a subsidiary of Xiaomi) often do not inferior to the original in quality, but they are cheaper.

Top.-5 Proven batteries for Xiaomi Mi9

We analyzed user reviews and technical tests to compile a list of reliable batteries for the Mi9, all of which are fast-charging compatible and overheat-proof.

Important: batteries with a capacity above 3800 mAh may not fit in the body of the Mi9 or cause problems with the charge controller.

If you choose a higher capacity model (like the Baseus 3800 mAh), consider that real life can increase by only 10-15% due to the power consumption of your smartphone, but these batteries wear out faster when used intensively.

How to distinguish the original battery from a fake?

Fake batteries for Xiaomi Mi9 are often sold under the guise of original, using similar labels and packaging. Here are 5 key signs that can be recognized as fake:

• 📄 No certificates. Complete with the original comes a leaflet with information about certification (for example, CE, RoHS).

Another way to test is to test with a multimeter, and connect the probes to the battery terminals.

The voltage on the new battery should be 3.8-4.0 V.

If less than 3.5V, the battery is discharged or defective.

If more than 4.2 V, the risk of overcharging is possible (dangerous!).

Also, look at the serial number. The original battery has a laser on it, and it doesn't wear out when it's rubbed, and fakes often have a number printed with paint that's smeared.

Step-by-step instructions for replacing the battery

Replacing the battery in the Xiaomi Mi9 requires care and minimal electronics skills. If you've never disassembled a smartphone, you'd better contact a service center.

Tools required:

• 🔧 Plastic blades (mediators) for opening the body.
• 🔨 The screwdriver. PH00.
• 🧲 Magnetic mat or screw tray.
• 🔥 Fryer (for softening glue).
• 🩹 Double-sided tape or glue B7000 fixing.

Turn off your smartphone and remove it. SIM-map|Battery discharge to 20-30% (for safety)|Prepare the workplace (clean surface, good lighting)|Take photos of the internal wiring before disassembly|Wear an antistatic bracelet (optional)-->

Step-by-step process:

1. Remove the back cover. Heat the edge of the body with a hair dryer (not above 60°C!) and gently tuck it in with a spatula. The glue holds the lid tightly, so proceed with caution.
2. Disconnect the battery plume from the motherboard (use a plastic blade to avoid damaging the contacts!).
3. Remove the old battery. Pick up the battery by the special "ears" (if any) or gently slap it on the side. If the battery is swelling, do not puncture it - it can cause fire!
4. Install a new battery. Stick the two-way tape to the old battery, install a new one, and plug in the plume.
5. Make sure all plumes are connected, and snap the back cover, warm up the edges with a hairdryer if necessary for better fixation.

After replacement, be sure to calibrate the battery:

1. Charge your smartphone to 100% and hold on charging for another 1-2 hours.
2. Discharge until it's automatically turned off.
3. Repeat the cycle 2-3 times.

1. Correct connection of the battery plume.

2. Integrity of contacts on the motherboard.

3.Voltage at the battery terminals (should be ~3.8 V).

If the problem persists, the board or power controller may have been damaged.-->

How to extend the life of a new battery?

Even the best battery will last longer if you follow simple rules of operation, here are 7 tips to help keep the battery capacity for years:

• 🔋 Avoid full discharge. The optimal charge range is 20-80%. Regular discharges to 0% reduce the life of the battery.
• ⚡ Don’t use “cheap” charging, only certified Quick Charge 4 adapters+.
• 🌡️ Watch the temperature. Don't leave your smartphone in the sun or near heat sources. Optimum temperature is 10-35.°C.
• 🛌 Don't charge overnight. Staying for a long time is 100% faster than the degradation.
• 🔄 Update software. Firmware often optimizes power consumption (for example, MIUI 12+ It has an improved battery management algorithm).
• 🎮 Limit the resource-intensive tasks when charging. Games or video rendering heat up the battery.
• 📴 Disable unnecessary functions. NFC, GPS, 4G (If not used, drain the battery even in standby mode.

If you notice that the battery is rapidly discharged, check the energy consumption in the settings:

1. Go to Settings. → Battery.
2. See which apps consume the most energy.
3. Limit background activity for "gluttonous" programs.

Rapid charging warning:

⚠️ Attention! if you use a charge above 27W (like 30W or 65W), it can speed up battery wear. - Xiaomi Mi9 Optimized for Quick Charge 4+, Higher currents heat the battery.

Frequent battery replacement errors and how to avoid them

Even experienced users sometimes make mistakes that lead to a smartphone breakdown or a battery failure, and here are the most common mistakes and ways to prevent them:

• 🔧 Screen plume damage, it's easy to hit the flexible display cable when you open the case. Solution: use plastic blades and act carefully.
• 🔥 Overheating the battery with a hairdryer. If you heat the case too much, you can melt the glue or damage the battery. Solution: Keep the hairdryer 10 to 15 cm away and don't heat one dot for more than 10 seconds.
• 🔌 If you misconnect the polarity or if you don't lock the connector properly, the smartphone won't turn on. Solution: check the markings. + and on the battery and board.
• 🧲 Loss of screws. Mi9 They use screws of different lengths, and if you mix them up, you can damage the board. Solution: put the screws in order or take pictures of their location.
• 💧 Moisture intake: If you replace it in a wet room, the contacts can become oxidized. Solution: work in a dry place, use a dryer if necessary.

If the battery is not turned on after the battery change, do not panic.

Black screen, but vibration is → Check the connection of the display plume.

- No charge. → Make sure the power controller is not damaged (check the voltage on the board).

- It's discharged fast. → The battery may not be calibrated (conduct 2-3 full charge-discharge cycles).

⚠️ If a new battery swells during the first days of use, immediately remove it and contact the store for a replacement.

FAQ: Answers to Frequent Questions