If you notice that your Asus Zenbook UX305C is draining too quickly, it means it is time to replace the battery. This is a maintenance task that is very straightforward. By following our instructions, you will restore your laptop’s battery life and performance.
This guide is your complete step‑by‑step manual: we explain each action in detail so you can carry out a safe and effective replacement. Care is needed, but the end result is worth it!
Key point: This model requires the battery with reference C31N1411. Always make sure your new part matches this reference before you start.
Preparation: before opening the laptop
Good preparation is the key to a smooth, trouble‑free disassembly.
1. Tools you’ll need for the replacement
Make sure you have the following tools ready on your work surface:
- A brand‑new battery (reference C31N1411).
- A precision screwdriver kit (for tightening/loosening the small screws).
- Non‑metal tools to open the device: a guitar pick or an old plastic card. Using metal objects is strongly discouraged to avoid damaging the casing.
- A clean, well‑lit table so you can clearly see all the components.
2. Making the laptop safe
Follow these steps to avoid any electrical risk or internal damage:
- Shut the laptop down completely: Use the Shut down option in Windows. Leaving the machine in sleep mode is risky.
- Unplug from the mains: The laptop must be completely disconnected from the wall socket and from the AC adapter.
- Remove accessories: Unplug all connected devices: mouse, USB sticks, cables.
- Avoid static electricity: Discharge any static from your body by touching a metal object that is earthed just before you start working.
Disassembly: removing the bottom cover
Patience is your best ally for this part. Every movement should be controlled.
1. Remove all the screws from the bottom cover
Place your Asus Zenbook UX305C upside down on the table. Locate all the screws holding the base in place.
- Be careful: Two screws are hidden under the small rubber feet at the back. Gently lift these two feet to access and remove the hidden screws.
- Remove all screws using the appropriate screwdriver.
- Recommended method: Keep the screws organised so you can put them back in exactly the same places during reassembly.
2. Unclip and remove the cover
The bottom casing is held in place not only by screws, but also by internal clips.
- Insert your plastic opening tool into the seam.
- Slide it gently along the edges to release the plastic catches.
- Do not use excessive force! If it seems stuck, double‑check that all screws (including those under the feet) have been removed.
- Once all the clips are released, lift off the cover without forcing it.
Fitting the new battery
The battery is now the most visible component inside the laptop.
1. Disconnect and remove the old battery
The old battery is screwed to the casing.
- Start by removing all the mounting screws that hold the battery in place.
- Delicate step: The battery cable is connected to the motherboard. Unplug this plastic connector by carefully pulling on the connector body, never on the wires.
- Once the screws are out and the cable disconnected, lift out the old battery.
2. Install the new battery (C31N1411)
- Place the new battery C31N1411 into its compartment.
- Tighten all the screws to secure it firmly to the casing.
- Reconnect the new battery’s connector to the motherboard. Make sure the connection is fully seated and properly aligned.
Final step: closing up and checking everything works
1. Refit the bottom cover
- Carefully align the rear casing with the rest of the laptop.
- Press gently around the edges so that all the retaining clips engage.
- Put all the screws back and tighten them.
- Stick the two rear rubber feet back on for a neat finish.
2. First test
- Plug the laptop into the mains.
- Power the machine on.
- It is recommended to let the laptop charge to 100% the first time you use it. This full cycle helps the system to correctly detect the new capacity.
