Xiaomi Redmi 3, released in 2016, is still a popular device, but time has been inexorably affecting the resource of its power system. Decreased autonomy, sudden shutdowns at 20% charge or bloating are direct signals that it is time to replace the battery. Many owners prefer to perform this procedure on their own to save on services of service centers, but are afraid to damage fragile components.
The process of disassembling this device has its own peculiarities related to the design of the metal case and the location of the plumes. Unlike modern models with removable covers, you will have to work with adhesive joints and carefully handle electronics. Before starting work, it is important to prepare a workplace with good lighting and a set of necessary tools so as not to damage the internal components.
In this article, we will discuss in detail how to remove the Xiaomi Redmi 3 battery without damaging the display module and motherboard. You will learn about the nuances of turning off the plumes, methods for safely removing an old battery and correctly installing a new battery.
To complete the procedure successfully, you will need a set of tools that you would like to prepare in advance. Lack of the right equipment can lead to breakage of the mounts or damage to the body, so take the preparation seriously.
- 🔧 Thin plastic card or mediator to open the case
- 🪛 Set of screwdrivers (cross-haired) PH000 flat)
- 🔥 A hair dryer or heating platform for softening glue
- 🧲 Magnetic screw-sorting mat
⚠️ Warning: Before starting any work, be sure to completely turn off the smartphone. Attempting to disassemble the enabled device can lead to a short circuit and failure of the motherboard.
The first step will be the extraction. SIM-This is standard procedure, but it's often forgotten, which can damage slots when dismantled, and then you have to unscrew the two screws at the bottom of the device on the sides of the charging connector.
And then the most important thing is that the back cover is separated from the frame, and the metal panel is glued around the perimeter, and you can't just remove it, and you have to heat the edges of the body evenly with a hairdryer to soften the adhesive base, and don't overheat one point, move the heat source around the perimeter.
💡
Use a suction cup to create an initial gap between the lid and the frame if the plastic card does not pass into the joint, which will reduce the risk of scratching the metal.
After warming up, gently insert the plastic card into the gap and guide it along the perimeter, cutting the adhesive layer. Act slowly so as not to damage the plume connecting the switch to the motherboard, which can be glued to the lid. Redmi 3's metal body requires care when working with tools.
When the lid is removed, you'll have access to the insides of the device, and you'll see a large black battery that occupies almost half the volume, and a metal plate that covers the connectors, and you'll need to unscrew the screws that hold this protective plate for further disassembly.
- 📱 Carefully pluck the plate and remove it.
- 🔌 Disconnect the plume of the main camera module
- ⚡ Disconnect the display plume from the motherboard
- 🔋 Turn off the battery connector.
Now that the main plumes are off, you can move on to the removal of the battery itself, which is attached to double-sided tape, which over time hardens very hard, you can't pull the battery sharply, which can damage it and even burn the contents.
It is recommended to warm up the battery area slightly again with a hairdryer through the back cover or directly the battery if it has already partially departed. Use a plastic blade to smack the battery from different sides, gradually separating it from the frame. Try not to deform the lithium polymer cell with the tool.
Once the old battery is removed, the seat must be thoroughly cleaned of the residue of the old glue. The surface must be flat and clean so that the new battery will lie tight and not hang around inside the case. Use isopropyl alcohol for degreasing if necessary.
The new battery often has a film-protected adhesive layer on it. If there is no adhesive, use B-7000 adhesive tapes or double-sided electronics tapes. Do not use superglue or other aggressive chemicals that could damage the battery.
| Parameter | Old battery | New battery |
|---|---|---|
| Capacity | 4000-4100 mic | 4000-4100 mic |
| Tension. | 3.85 In | 3.85 In |
| The state of the glue | Solid, requires heating | Fresh, sticky layer |
| Thickness | Could be bloated. | Smooth, free of deformities |
Install the new battery in the seat, pairing the connector with the contact group on the board. Press until the characteristic click, making sure that the connector is up straight. Don't put too much effort into not breaking the plastic guide connector.
Before you finally build it, it makes sense to check if the system is working, plug the plugs on the display and the main board, then press the switch on. If the screen catches fire and the phone starts charging, you did it right. If not, double-check the density of the connectors.
☑️ Pre-assembly check
The assembly is done in reverse order, first a metal shield plate is installed and screwed, then the plumes of the display and the cameras are connected, only then you can carefully stack the plumes and close the body.
When you install the back cover, make sure that all the wires and plumes are in their channels and not clamped. If the cover is not tight, do not press hard - check if any element did not fall into the wrong place. All-metal body requires precision when docking.
⚠️ Warning: Don't turn the phone on permanently until you make sure all screws are swirled.The engine vibration or speaker can shift loose parts inside.
Use a new layer of glue or special adhesive tape to fix the lid, apply the composition evenly around the frame perimeter and press the lid tightly, lock the device with rubber bands for 15-20 minutes before the initial grasp of the glue.
Once assembled, it is recommended to conduct the first charge-discharge cycle, completely discharge the phone before turning off, and then charge it to 100% when turned off, which will help the power controller calibrate and correctly display the charge level.
What if the phone doesn’t turn on after replacement?
Pay attention to the heating of the device during operation, if the phone warms up in the battery area even when it is downtime, this may indicate a poor quality battery or problems with the charge controller on the board, in which case it is better to consult specialists.
A high-quality battery can significantly extend the life of your smartphone, making it comfortable to use. Correctly executed replacement allows you to save money and gain experience in self-repair gadgets.
💡
The main secret of successful replacement is to take your time when unplugging the battery and thoroughly clean the seat before installing a new element.