Redmi 6A series smartphones have been popular due to their availability and reliability, but over time, even the best battery loses capacity. If your phone stops holding charge, turns off 20-30% or the body is swollen, replacing the battery becomes the only sure solution to extend the life of the gadget. Modern lithium-polymer batteries have a limited resource of recharge cycles, usually between 500 and 800 full cycles.
This procedure will save you a significant amount of money by doing it yourself, as the cost of a new battery in a retail network is not comparable to the cost of a service at an authorized service center. However, before starting disassembly, you need to clearly understand the risks associated with leakage of the case and working with electrical components. The Redmi 6A uses a non-removable adhesive battery that requires a special approach to dismantling.
In this article, we will take a look at each step of the process, from the selection of components to the final assembly of the device, which tools will be required, how to safely disconnect the plumes and how to properly activate the new battery. Careful follow the instructions minimizes the likelihood of damage to the display plumes or the motherboard itself.
Diagnostics and selection of components for replacement
The first step in the process of restoring your smartphone’s autonomy is to accurately diagnose the current battery status. Not always a quick discharge indicates physical wear of the chemical composition; sometimes the problem lies in software failures or background processes. Check the power consumption statistics in the Settings → Battery and performance menu to rule out abnormal application activity.
If the diagnostics confirm wear, you need to buy a quality battery. The market is oversaturated with cheap copies that can not only quickly fail, but also damage the phone's power controller. The original or certified counterpart is the only acceptable option for the Xiaomi Redmi 6A, since cheap batteries often have a real capacity of half the declared.
When choosing, pay attention to the presence of holograms, the quality of the printing on the case and the marking of the BN37 model. It is also important to check the voltage, which should be the standard 3.85V. Buying a battery from trusted suppliers with a guarantee significantly reduces the risks.
- 🔍 Check the model markings BN37 on the back of the old battery before recycling.
- 🔋 Make sure the new battery voltage meets the device specification (3.85V).
- 🛡️ Look for holograms and protective codes on packaging to verify originality.
- 📉 Avoid batteries with swollen edges or damaged contact insulation.
Necessary security tools and measures
A good battery replacement is not possible without a specialized tool that allows you to work with miniature components without damaging them. The standard home craftsman kit, including screwdrivers and a knife, is not suitable here, since there is a high risk of damaging the plumes or crumbling the glass of the rear cover. You will need a set of precision screwdrivers, in particular the Phillips cross #000.
Special attention should be paid to tools for working with adhesive joints. the Redmi 6A back cover is glued around the perimeter, and it requires heating and thin plastic blades to remove it safely. Metal tools can damage internal components or close contacts, so only use plastic mediators or special blades.
⚠️ Warning: Be sure to turn off the device before work begins. Working with conductive tools in the phone turned on can short-circuit and cause the motherboard to fail.
Also, be sure to prepare a suction cup to lift the lid and tweezers to extract small parts. Use a magnetic mat or organizer to fix the screws so as not to lose them and not confuse the length, as the design of the smartphone uses screws of different sizes.
- 🛠️ A set of precision screwdrivers (cross and flat).
- 🔥 A hair dryer or hot water heater to soften the glue under the back cover.
- 🧩 Plastic blades and mediators for opening the body.
- 🧲 Magnetic mat or organizer for sorting screws.
Rear cover removal process
The beginning of the disassembly is the most critical moment, requiring patience and accuracy. The Redmi 6A rear panel is attached to a two-part glue that must be heated to a temperature of about 80-90 degrees Celsius. Do not use an open fire or too high temperatures, as this can damage the display on the back side or deform the plastic frame.
After the body perimeter warms up evenly, install a suction cup at the bottom of the back cover, receding about 2-3 cm from the edge. Pull the suction cup up, creating a small gap between the lid and the frame, and gently insert a plastic blade into the resulting slit. Move the scapula along the perimeter, gradually cutting the adhesive layer.
Be especially careful about the camera module and fingerprint scanner (if it is integrated into the cover, although in 6A it is on the plume).Sharp movements can lead to the tearing of the plumes or cracks in the plastic. If the cover is removed with difficulty, add a little more heat, but do not use excessive force.
What to do if the lid is not removed?
Disconnecting plumes and removing the old battery
Once the back cover is successfully removed, the inside of the smartphone will open to your eye, and the first step is to disconnect the battery plume from the motherboard to completely de-energize the device, a critical step for safety and security, preventing accidental short circuits when other components are turned off.
The battery in the Redmi 6A is mounted on double-sided tape, which can be quite durable. Use a plastic card or a spatula to extract it, putting the battery on the bottom. Do not puncture the battery case or bend it, as damage to the lithium polymer cell can lead to ignition or chemical burn.
If the battery is sitting very tight, you can warm up the area underneath a little bit through the body, but with extreme caution, and it also helps to use isopropyl alcohol, which can be injected under the edges of the battery to dissolve the adhesive layer, and after extraction, inspect the compartment for glue residue and remove it.
☑️ Checklist before installing a new battery
Installation of a new battery and assembly
Before installing a new battery, you need to prepare the seat. Remains of old glue can create bumps that prevent the new battery from lying tight, causing it to shift or damage when assembled. Carefully clean the surface of the plastic bezels and the back of the screen.
Apply new strips of double-sided tape to the case or to the battery itself (usually included). Carefully install the new battery by matching the connector on the board. Press the battery over the entire area for secure locking. Now you can plug the plume into the characteristic click.
Before the final assembly and twisting of the screws, it is recommended to perform a test turn on. Press and hold the power button. If the screen catches fire and the phone shows the charging or loading process, then all connections are made correctly. Only after successful verification can you apply new glue to the frame and install the back cover.
| Parameter | Old battery | New battery | Status |
|---|---|---|---|
| Capacity | Less than 2,500 mAh | 3,000 mAh | Replacement required |
| Tension. | Unstable. | 3.85V | Norma. |
| Physical condition | Bloating/Deformation | Smooth surface | Safe. |
| Firming | Glue residues | New scotch | Ready. |
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After installing the new battery, take your time to load the phone with games immediately.Let the device fully charge when turned off for 2-3 hours to calibrate the power controller.
Typical errors and troubleshooting
When replacing a battery, even experienced craftsmen can face unexpected situations, and one of the most common mistakes is that the plume of the main camera module or the display plume is damaged when the lid is not neatly removed, and these components are located very close to the edges of the case and require special care when using the blades.
Another common problem is that the phone doesn't turn on after assembly, often due to a battery connector that's not fully inserted or contacts that are oxidized, and it's also worth checking if the power button plume has been accidentally turned off, which in some versions can be separate.
⚠️ Warning: If the battery starts to warm up strongly after the replacement, turn off the phone immediately.This may indicate a short circuit inside the battery or a faulty charge controller on the board.
Sometimes users forget to remove the protective film from the contacts of the new battery, which leads to no contact. Always check for such films (usually transparent or yellow) before installing. Also make sure that the screws are twisted with the right force to avoid disrupting the thread in the plastic case.
- 📱 Phone not turned on: check the density of the battery connector landing.
- 🔋 Battery warms up: possible marriage of the power element or KZ on the board.
- 📷 Camera not working: check the integrity of the camera module plume.
- 🔊 No sound: make sure the plume of the lower speaker is connected correctly.
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Good workplace preparation and good lighting prevent 90% of battery replacement errors associated with loss of small parts and damage to plumes.