Xiaomi Redmi 4X is widely considered a budget legend, largely due to its power consumption. Users often search for information about which battery is installed in this device to understand whether to change it or how to extend the life of the current battery. The answer lies in the technical specifications that make this device unique for its release time.
The main advantage of the model is the use of a lithium-polymer battery with a high energy density, which allowed engineers to fit a huge charge into a compact metal case, and if you own this device, you're probably interested in knowing the exact parameters that affect the autonomy of the gadget in everyday use cases.
In this article, we will take a look at the characteristics of a regular battery, look at compatible analogues, and describe the replacement procedure. Understanding what capacity and type of chemistry is used in your phone will help avoid mistakes when buying a spare part, which is especially important because the market is full of low-quality copies.
Technical characteristics of the full-time battery
The standard battery for the Redmi 4X is marked BN41, a key identifier you need to know when searching for an original spare part, and it is this code that ensures that the connectors are compatible and the power controller works correctly with the smartphone motherboard.
The nominal capacity of the cell is 4100 mAh, which is an excellent indicator even by modern standards for entry-level devices.Typical capacity can vary slightly depending on the batch, but the standard is kept at 4000-4100 mAh. This provides up to two days of moderate use.
The battery voltage is 3.85 V and the power capacity is 15.78 Wh. These parameters allow the Snapdragon 435 processor to work optimally without sudden voltage surges. It is important to note that the actual operating time depends not only on the capacity, but also on the state of the MIUI operating system.
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The BN41 label is the only true reference when buying the original battery for the Redmi 4X, ignoring this code will result in the purchase of an incompatible part.
Consider that the manufacturer's declared capacity is measured in a laboratory setting, and in reality, wear starts from day one, but high-quality assembly allows the battery to retain up to 80% of its life after 500 full charge-discharge cycles.
Compatibility and search for the original model
There is often confusion when looking for a replacement, as many batteries are visually similar. For the Xiaomi Redmi 4X, it is critical to find a model with the BN41 code. Other batteries, even if they physically fit into the compartment, may have a different location of the plume contacts.
Original batteries are supplied in a special protective package with holograms and QR-The battery itself should have a clear laser engraving of all parameters, blurry text or the absence of protective stickers on the contacts is a sure sign of counterfeiting.
Compatibility is also software-tested. Once a new battery is installed, the MIUI system may require calibration or show a message about an untested battery if the battery memory chip does not contain the correct factory data.
How to check the battery through the engineering menu?
When buying from third-party sources, pay attention to the weight of the part. The original BN41 battery weighs about 85 grams. A significant deviation in the lower direction indicates the use of less capacious and cheap components inside the case.
Signs of wear and need for replacement
There are a number of indirect and direct signs that you can tell that you're running out of battery life, and the most obvious is that you're seeing a dramatic reduction in battery life from a single charge, and if a phone that used to live two days now runs out by lunch, that's a cause for concern.
The second sign is unstable behavior of the charge indicator, the smartphone can show 20% and suddenly turn off, or "stuck" by 99% when charging, which indicates the degradation of the cells and the controller's inability to correctly read the residual capacity.
⚠️ Warning: If the back cover of the smartphone has started to spontaneously move away from the case or you notice bloating in the lower part of the screen, immediately stop using the device.
Also worth paying attention to the heating of the case during charging or simple operations. Strong heating in the area of the battery location often indicates internal resistance, which has grown due to the aging of chemical elements.
Software errors can also mimic problems with iron. Before replacing, it is recommended to reset settings or analyze usage statistics in the Settings → Battery menu. If the background processes consume energy, replacing the battery will not solve the problem.
Instructions for self-replacement of the battery
Replacing the battery in the Redmi 4X requires care, because the back cover is glued around the perimeter. To work, you'll need a dryer to heat the glue, a suction cup, a thin plastic spatula and a set of screwdrivers. The process does not require soldering, but care is required.
The first step is to turn off the smartphone and retrieve it. SIM-Then heat the perimeter of the back cover with a hair dryer to about 60 to 70 degrees. Do not hold the hair dryer too close so as not to damage the display matrix or plastic frame.
☑️ Replacement tools
Once the suction cup is heated, it attaches to the bottom of the lid, and a slight jerk creates a gap, and a spatula is inserted into this gap, and plastic latches are gently snapped around the perimeter, the main thing is not to damage the fingerprint scanner plume, which can be glued to the lid.
Then you unscrew the screws that hold the metal plate over the battery, and the battery plume is disconnected from the motherboard with a light movement, and the old element is removed, if necessary, by putting a blade on it, if it is glued to double-sided tape.
⚠️ Note: It is strictly forbidden to use metal tools (needles, scissors) to remove a bloated battery.
The new battery is put in place, the plume is connected, and the device is checked to turn on before final assembly, and if everything works, a new layer of glue is applied and the lid is fixed with rubber bands for 1-2 hours until completely dry.
Operational and extension rules
To make a new or even an old battery last longer, it is important to follow the rules of operation. Lithium polymer cells do not like extremes: deep discharge to zero and constant charging at 100%. The optimal range for a long life is from 20% to 80%.
Use only original or certified Quick Charge-enabled chargers, if claimed.Cheap power supplies can give off unstable voltage, which kills the battery controller faster than the chemistry itself.
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Try not to leave your phone charging overnight on a regular basis. Although modern controllers turn off the current, micro-charge cycles to maintain 100% put extra strain on the cells.
Temperature is also critical. Don't leave your smartphone in the sun, on the dashboard of your car, or near the heater. High temperatures accelerate the degradation of the electrolyte inside the battery irreversibly.
Once a month, it's useful to calibrate the phone before it turns off, then charge it to 100% off, and hold it for another hour, which helps the system to accurately display the capacity.
Comparison with analogues and market offers
There are three types of batteries for the Redmi 4X in the parts market: originals (OEM), high-quality copies (High Copy) and outright marriage. The original always has Xiaomi labels and protective holograms. Copies can have a similar look but less real capacity.
The table below compares the main characteristics of the original battery and the typical analogues on sale:
| Characteristics | Original Xiaomi BN41 | Quality analogue | Cheap copy |
|---|---|---|---|
| Capacity (real) | 4,000–4100 mAh | 3200-3500 mAh | 2000–2500 mAh |
| Weight. | ~85g | ~75g | ~60g |
| Cycle resource | 500+ cycles | 300 cycles | 100 cycles |
| Price. | Tall. | Medium | Low. |
When choosing between the original and the analogue, you should weigh the risks. A cheap battery can swell in 3-4 months, requiring re-disassembly of the phone, and the savings in this case often come in the wrong direction.
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Buying a battery at a price much lower than the market almost guarantees the receipt of goods with a real capacity of 50-60% of the declared.
Certified third-party manufacturers like Nohon or Deji often offer a good price-performance balance. their products may not have the Xiaomi logo, but technically fully meet the device's requirements.