The Redmi 6 series, launched in 2018, has already established itself as a reliable workhorse, but time inexorably affects their power consumption. Over time, lithium-ion batteries lose their capacity, which manifests itself in rapid discharge, sudden shutdowns with 20-30% charge or even bloating. If you encounter such symptoms, replacing the battery becomes the only sure solution to prolong the life of the device.
The power extraction process in this model has its own characteristics, which distinguish it from more modern devices with non-removable rear covers. Xiaomi Redmi 6 uses a classic layout with access to the insides through the rear panel, which greatly simplifies the task for the home craftsman. However, even with a relatively simple design, you need to strictly adhere to the technology of disassembly, so as not to damage the plumes or the body itself.
Before you start active, you need to prepare the workplace and make sure you have the right tool. Negligence during the preparation stage often leads to the loss of small screws or damage to plastic latches. It is critical to completely discharge the device to 0% before starting work to minimize the risk of short circuit when the connector is turned off. Below we will discuss in detail each step of the procedure.
⚠️ Warning: If you notice that the old battery is very swelled and presses on the screen or back cover, act with utmost care.
Tools and workplace preparation required
To successfully perform a battery replacement, you will need a minimal set of tools that can be purchased from any electronics store or ordered online. The main task is to gently open the case without damaging the plastic and disconnect the plumes. Using inappropriate items such as a knife or a screwdriver with a wide sting can lead to scratches on the frame or chips.
It is recommended to prepare a flat work surface covered with soft material in advance so as not to scratch the screen of the smartphone. It is also highly advisable to use an antistatic bracelet or regularly touch a grounded metal object, since static electricity can damage the sensitive electronics of the motherboard.
Here is a list of what to put on your desk before starting the procedure:
- 🔧 Sets of screwdrivers (Cross Phillips #00 or #000 for screws of the body).
- 🎴 Plastic blade (mediator) or thin plastic card for opening latches.
- 🌡️ A hair dryer or thermophene (to soften the glue if the cover is planted on an adhesive).
- 🧲 Magnetic mat or small screw folding container.
- 🔋 New battery model BN45 (original).
Make sure the lighting in the room is adequate, as there are small parts and plumes inside the case that are easily damaged in poor visibility. If you have a magnifying glass or a magnifying glass, they will not be superfluous, especially when working with a battery connector.
☑️ Preparation for disassembly
Removal of the back cover and dismantling of components
We start disassembling the device directly. Xiaomi Redmi 6 is designed so that the back cover is held on plastic latches around the perimeter and, in some revisions, on adhesive basis. The first step should always be to remove the tray for the purpose of the product. SIM-cards and memory cards to avoid accidental damage to contacts when the body is bent.
After removing the tray, carefully inspect the perimeter of the device for hidden screws. In this model, there are no visible screws on the back, they are hidden under plastic plugs or absent, since the mounting is mainly on latches. Carefully insert the plastic blade into the junction between the frame and the back cover, starting from the lower corner near the charging port.
Move the shoulder blade along the perimeter, snapping the locks. Don't be afraid to apply moderate force, the plastic is strong enough here, but avoid sharp jerks. If the lid does not lend itself, maybe your version uses glue - in this case, slightly warm the edges with a hairdryer for 30-40 seconds, without holding the jet of hot air too close to the surface.
When you remove the lid, you'll see the inside of the smartphone, and before you touch the inside, you'll need to unscrew all the screws that hold the plastic cover that covers the display and battery plumes, and they're usually around. 10-12 They can be of different lengths, so remember the location of each screw or spread them according to the scheme.
⚠️ Warning: Never use metal tools (tweezers, needles) to snap the lid.The metal can slip and break through the battery, causing an instant fire.
Disconnecting plumes and removing the old battery
Once we remove the protective metal or plastic plate, we access the main modules, and the first thing you need to do is turn the device off, find the battery connector on the motherboard, which is usually located at the top of the board, next to the display connector.
Use a plastic shoulder blade or nail to gently squeeze the connector up. Don't pull the wires! The battery plume in Redmi 6 is quite short, so a sharp movement can cause it to cliff. Once the battery is turned off, the smartphone is guaranteed to turn off even if the power button has been pinched.
Now we can move on to extracting the battery itself, and in this model, the BN45 battery can be attached to a double-sided tape or simply inserted into a niche, and if the battery is glued, it needs to be gently tucked into the plastic card from the end and, as it rocks, separated from the body.
It is important to remember the following nuances when working with an old battery:
- 🚫 It is strictly forbidden to bend or pierce the battery body.
- 🔥 Do not heat the battery with an open fire or a building hair dryer directly.
- ♻️ Old battery should be disposed of in a special container, not thrown into the general garbage.
- 🧤 If the battery shows traces of electrolyte (white plaque or liquid), work with gloves.
If you plan to use an old battery temporarily, isolate its contacts with tape. For a new battery, preparation is minimal - they usually come with already pasted adhesive strips or require self-application.
What to do if the battery is not removed?
Installation of a new battery and assembly of the device
Installing a new power source requires attention to detail. Before you stick a new battery, be sure to wipe the niche in the case with an alcohol wipe or degreaser to remove the remnants of old glue and dust. The surface should be clean and dry for reliable fixation.
If the new battery does not have adhesive base, use special adhesive tapes to repair phones or high-quality double-sided tape. Apply glue only on the frame of the case, avoiding the battery center, so as not to disturb the heat sink and damage the elements in case of possible swelling in the future.
The sequence of actions during assembly:
- Insert the new battery into the niche, making sure it lies flat.
- Connect the battery plume to the motherboard before the characteristic click.
- Check if the plume is clamped and put it carefully.
- Return the protective plastic lining to place and twist all the screws.
- Set the back cover by snapping it around the perimeter.
After physical assembly, take your time to turn on the device immediately. Let the glue grab (if newer one was used) for 15-20 minutes. On the first turn on, the phone can load longer than usual - this is the normal reaction of the system to new equipment.
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The first battery switch is better done by connecting the smartphone to the original charger, which will help calibrate the power controller.
Characteristics and compatibility of batteries
When choosing a new battery, it is important to focus not only on price but also on technical parameters. The market is full of copies that can pass off wishful thinking. Below is a table to compare the original characteristics and typical indicators of cheap counterparts.
| Parameter | Original Xiaomi BN45 | Quality copy | Cheap analogue |
|---|---|---|---|
| Capacity (typical) | 3,000 mAh | 2800-2900 mAh | 1500-2000 mAh |
| Tension. | 3.85 In | 3.85 In | 3.7-3.8 Included |
| Weight. | ~45g | ~40-44g | ~30-35g |
| Term of service | 500+ cycles | 300-400 cycles | 50-100 cycles |
Pay attention to the weight of the battery: if a new battery is suspiciously light, it means that less capacious cells are used inside or saved on materials.
Also check the production date stamped on the label or case: Batteries should not be stored for more than a year before installation, as chemical degradation processes begin immediately after production, even without use.
Calibration and initial adjustment after replacement
After successful replacement and first activation, the system may not display the charge level correctly, because the power controller "remembers" the parameters of the old, worn-out element, and in order for the smartphone to work steadily, you need to conduct a calibration procedure.
The idea is to have a full charge-discharge cycle. Discharge the phone until it's completely turned off (0%). Then, without turning it on, charge it to 100%. After you reach full charge, hold it for another 1-2 hours. Then turn on the phone and check the charge level.
If the indicator is not 100%, repeat the procedure. Usually one or two full cycles are enough to recalibrated charge controller and start correctly displaying the energy, this is especially important for Android devices, where the software is closely related to the hardware.
⚠️ Warning: Do not use third-party apps to “battery calibrate” from the Play Market. These are often useless junk with ads and can even harm the system by requiring unnecessary access rights.
In the process, try not to bring the lithium-ion battery to deep discharge regularly, the optimal range for a long battery life is from 20% to 80%.
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Proper battery calibration takes 1-2 full charge cycles and is necessary to correctly display the percentage of charge with the Android system.