Replacing the battery in an ASUS laptop: understanding CMOS and the battery

Replacing the battery in a laptop ASUS - a task that sooner or later faces every owner of equipment of this brand. But not everyone understands that “battery” can mean two completely different elements: CMOS battery (responsible for saving BIOS settings and time) and main battery (powers the device without an outlet). Mistakes in replacing any of them can result in factory resets, data loss, or even damage to the motherboard.

In this article we will analyze both scenarios: how to change tablet CR2032 (or similar) on the board, and how to remove a dead lithium-ion battery in models ASUS ZenBook, VivoBook, ROG Strix and others. You will learn what tools you will need, how to avoid common mistakes, and what to do if the laptop does not turn on after replacement. And for owners of older models (for example, ASUS K53SV or X550C) we have prepared separate recommendations - their design often requires a non-standard approach.

CMOS battery vs accumulator: what is the difference and how to determine what needs to be changed

Before you take a screwdriver, it is important to understand which battery has failed. Their symptoms of failure are different:

• ⚡ CMOS battery (usually CR2032 or CR2026): the time/date in the BIOS is reset, the laptop asks to press F1 To continue downloading, the download settings disappear (for example, SSD priority). The battery lasts 5–10 years, but may run out sooner due to changes in temperature or humidity.
• 🔋 Main battery: Laptop discharges quickly (holds charge for less than 30 minutes), turns off when the power supply is disconnected, Windows shows the message “Consider replacing the battery.” Average service life is 300–500 charging cycles (2–4 years).

If you are not sure what exactly went wrong, perform a simple check:

1. Unplug your laptop.
2. Remove the main battery (if it is removable).
3. Connect the power supply and try to turn on the device.
   • ✅ The laptop turns on - the problem is battery.
   • ❌ It doesn’t turn on or the settings are reset - it’s your fault CMOS battery.

In models ASUS recent years (for example, ZenBook 14 UX425 or ROG Zephyrus G14) The CMOS battery is often soldered to the board, and the battery is integrated into the case. This makes replacement difficult, but does not make it impossible. The main thing is not to confuse the types of batteries: CR2032 (3V, 220 mAh) and CR2026 (3V, 160 mAh) are similar in appearance, but the latter is thinner and less capacious. Using the wrong battery will result in frequent BIOS crashes.

Tools and preparation: what you need for replacement

The list of tools depends on the laptop model and the type of battery being replaced. For CMOS in most cases, the minimum set is enough, and for battery Specialized equipment may be required.

Battery type	Tools	Additionally
CMOS (CR2032/CR2026)	Plastic spatula, Phillips screwdriver (PH00), tweezers	Multimeter (to check voltage), alcohol wipes
Battery (removable)	Phillips screwdriver (PH0/PH1), plastic pick	Thermal paste (if replacement of thermal pads is required)
Battery (soldered in)	Soldering station (30–40 W), solder, flux, solder sucker	Heat dissipation pad, anti-static wrist strap

For models with hidden screws under the legs (For example, ASUS VivoBook S14 S433) will also be needed special star wrench (Torx T5) or a sticker removal kit. If you have never disassembled laptops, it is better to purchase them in advance electronics repair kit with magnetic attachments - this will protect the screws from loss.

⚠️ Attention: If your laptop is under warranty, replacing the battery (especially the battery) yourself will void the warranty. In this case, contact the service center ASUS — they have original spare parts and tools for safe dismantling.

Before starting work:

• 🔌 Disconnect the laptop from the network and remove the battery (if it is removable).
• 📱 Take a photo of the location of the screws and connectors - this will help with reassembly.
• 🧲 Use an antistatic wrist strap or periodically touch a grounded metal object to release static electricity.

Step-by-step instructions: how to replace the CMOS battery in an ASUS laptop

Replacement process CR2032 in laptops ASUS differs depending on the model. We will consider two scenarios: for devices with removable battery (For example, ASUS X550C) and for models where it is soldered into the board (For example, ASUS ROG Strix G15).

Scenario 1: Removable battery (classic version)

This method is suitable for most budget and office laptops ASUS release until 2018.

1. Remove the back cover. Unscrew all the screws (usually 8-12 pieces) and carefully pry the cover off with a plastic spatula, starting from the corner. In some models (for example, ASUS K55VD) the lid can be secured with latches - do not use excessive force to avoid breaking them.
2. Find the CMOS battery. It looks like a round metal “tablet” with a diameter of ~20 mm, often located next to the RAM connector or under the heatsink. B ASUS N56VZ, for example, the battery is hidden under black insulating tape.
3. Remove the old battery. Gently pry it off with tweezers or a flathead screwdriver. If the battery is stuck, do not pull by force - heat it with a hairdryer at a minimum temperature (not higher than 60°C) to loosen the glue.
4. Install a new battery. The polarity is indicated on the board: “+” must match the mark. Press until you hear a click.

After replacing, turn on the laptop and check the BIOS settings (Del or F2 when loading). If the time is reset, set it manually and save the settings (F10).

Scenario 2: Soldered-in battery (modern models)

In ultrabooks ASUS ZenBook and gaming laptops ROG The CMOS battery is often soldered to the board. To replace it, you will need a soldering iron and skills in working with microelectronics. Algorithm of actions:

1. Unsolder the old battery. Heat both pins at the same time to avoid damaging the traces on the board. Use a suction cup to remove solder.
2. Clean the contacts. Remove any remaining solder with alcohol and check the integrity of the traces with a multimeter.
3. Solder the new battery. Use a small amount of solder to avoid creating a short. For reliability, secure the battery with hot glue.

⚠️ Attention: If you have never soldered SMD components, it is better to entrust this work to a professional. Improper soldering can damage the southbridge or other board components, leading to costly repairs.

What should I do if the laptop does not turn on after replacing CMOS?

If your laptop does not respond to the power button, check:

1. Correct installation of the battery (polarity!).

2. Integrity of contacts on the board (the conductor may have become unsoldered).

3. Presence of a short circuit (check with a multimeter).

If the problem persists, reset the BIOS by removing the battery for 10 minutes and shorting the contacts with a screwdriver.

Replacing the main battery: removable vs built-in

The process of replacing the main battery is more complex than that of a CMOS battery and is highly dependent on the design of the laptop. Let's consider both options.

Removable battery (older models)

In laptops ASUS until 2015 (for example, ASUS X550LD or K551LN) the battery is usually removable. To replace it:

1. Turn the laptop over and locate the battery latches (usually two sliders).
2. Slide the latches to the side and carefully remove the battery.
3. Install the new battery, aligning the contacts, and snap the latches into place.

Important: buy a battery with original article (For example, C11P1305 for ASUS N56VZ). Cheap analogues often have a smaller capacity and can swell over time.

Built-in battery (modern models)

B ASUS ZenBook, VivoBook And ROG The battery is integrated into the housing and secured with screws. To replace:

1. Remove the back cover (as described above).
2. Disconnect the battery cable from the motherboard. In some models (for example, ASUS ROG Strix G17) the cable may be glued - carefully pry it off with a plastic spatula.
3. Unscrew the screws securing the battery (usually 4-6 pieces).
4. Remove the old battery and install a new one by connecting the cable.

In models with liquid metal thermal interface (For example, ASUS ROG Zephyrus G14) after replacing the battery, it may be necessary reassembly of the cooling system with new thermal paste. If you are not confident in your abilities, contact the service.

Common mistakes and how to avoid them

Even experienced users sometimes make mistakes when replacing batteries in laptops. ASUS. Here are the most common ones and how to prevent them:

• 🔧 Using inappropriate tools. The wrong size Phillips screwdriver can strip the screw slots. Always check the label: for laptops you usually need PH00 or PH0.
• 🔥 Overheating when soldering. Prolonged exposure to a soldering iron (more than 3 seconds) can damage the traces on the board. Use heat sink tweezers and a soldering iron with a power of no more than 40 W.
• ⚡ Forgetting to reset the BIOS after replacing CMOS. If the laptop does not turn on, try removing the battery for 10 minutes or shorting the contacts CLR_CMOS (if they are on the board).
• 📦 Buying a non-original battery. Cheap analogues may not correspond to the declared capacity or swell after a few months. Check seller reviews and request quality certificates.

Another common problem is battery cable damage when disconnected. In models ASUS ROG The cable is often fragile and soldered to the board. If you feel resistance when disconnecting, do not pull by force - it is better to warm up the soldering area with a hairdryer.

Error	Consequences	How to fix
Wrong CMOS polarity	Short circuit, failure of the south bridge	Check the markings on the board, replace the battery
Damage to battery latches	The battery is not fixed, poor contact	Use glue or replace the battery cover
Overheating of the board during soldering	Detachment of tracks, device inoperability	Contact the service to restore tracks

1. The cable is connected correctly.

2. Condition of the charging controller (may burn out if short circuited).

3. BIOS settings (in some models you need to enable support for the new battery manually).-->

ASUS models with non-standard design: replacement features

Some laptops ASUS have unique engineering solutions that make it difficult to replace batteries. Let's look at the most problematic models.

ASUS ZenBook (UX, SX series)

In ultrabooks ZenBook The battery is often glued to the case with double-sided tape. To extract it:

1. Heat the body with a hairdryer (temperature no higher than 70°C) to soften the glue.
2. Carefully pry the battery out with a plastic spatula, starting from a corner.
3. Clean any remaining adhesive with alcohol before installing a new battery.

B ZenBook Flip (transformers) the battery can be hidden under the screen. To access it, you will have to completely disassemble the device, which requires experience.

ASUS ROG (Strix, Zephyrus, Scar series)

Gaming laptops ROG often have:

• 🔋 Two batteries (on some models Strix).
• 🔧 Hidden screws under the rubber feet.
• 🔥 Liquid metal thermal interface, which requires replacement after disassembly.

B ROG Zephyrus G14/G15 To replace the CMOS battery, the cooling system must be removed, which increases the risk of damage. If you are not confident in your skills, it is better to contact the service.

ASUS TUF Gaming (FX, FA series)

In laptops TUF Gaming The battery is often secured not only with screws, but also with metal clamps. When disassembling:

1. Unscrew all the screws around the perimeter of the battery.
2. Carefully pry back the clips with a flathead screwdriver.
3. Do not pull the battery by the cable - it may come off!

How to check the originality of an ASUS battery?

The original battery has:

1. Hologram with ASUS logo on the label.

2. Serial number matching the data in the BIOS (checked via MyASUS).

3. Capacity corresponding to the passport values (for example, 57 Wh for ASUS TUF A15).

Counterfeits are often lighter in weight and have blurry markings.

What to do after replacement: setup and testing

Successfully replacing the battery is only half the battle. In order for the laptop to work stably, you need to configure it correctly and check it.

After replacing the CMOS battery

1. Reset BIOS settings. Go to BIOS (Del/F2) and load default settings (Load Default Settings).
2. Update your BIOS. Download the latest version from the website ASUS and install it via EZ Flash (built-in utility in BIOS).
3. Check the time and date. If they reset after turning off, the battery is installed incorrectly or is faulty.

After replacing the battery

1. Calibrate the battery. Charge the battery fully, then discharge to 5% and charge again to 100%. Repeat the cycle 2-3 times.
2. Check your drivers. Install the latest version ATK Package And ASUS Battery Health Charging from the official website.
3. Set the charging mode. In the utility MyASUS select the optimal mode (Balanced Mode or Maximum Lifespan).

If the laptop does not recognize the new battery, try:

• 🔌 Disconnect the power supply and remove the battery for 1 minute, then connect it back.
• 🔄 Reset EC/BIOS (remove CMOS battery for 10 minutes).
• 📥 Reinstall the driver Microsoft ACPI-Compliant Control Method Battery in Device Manager.

⚠️ Attention: If, after replacing the battery, the laptop turns off when you disconnect the power supply, even when it shows 100% charge, the charging controller is most likely faulty. In this case, diagnostics are required at a service center.

FAQ: Frequently asked questions about replacing batteries in ASUS

Is it possible to replace the CMOS battery with a larger one (for example, CR2032 instead of CR2026)?

Yes, but with reservations. CR2032 (220 mAh) will last longer than CR2026 (160 mAh), but its thickness is greater (3.2 mm versus 2.5 mm). In most laptops ASUS this is not critical, but in some ultrabooks (for example, ZenBook UX333) may not fit. Check the clearance above the battery before replacing.

Which battery should I buy for ASUS ROG Strix G15 (2021)?

Original article - C31N1706 (4-cell, 90Wh). Analogues from Green Cell or NewerTech, but make sure they support fast charging (up to 100W). Avoid unlabeled batteries Li-ion or with a capacity higher than 90Wh - this may lead to overheating.

What to do if, after replacing CMOS, the laptop beeps and does not turn on?

This is a sign incorrect battery installation or BIOS corruption. Try:

1. Remove the battery and close the contacts CLR_CMOS for 10 seconds.
2. Connect the power supply and try to turn on the laptop without the battery.
3. If it doesn't help, reflash the BIOS via CH341A (programmer required).

How much does it cost to replace a battery at an ASUS service center?

The cost depends on the model:

• Budget laptops (For example, VivoBook X515): 3,000–5,000 ₽ (with work).
• Gaming (ROG Strix/Zephyrus): 8,000–15,000 ₽ (including diagnostics of the cooling system).
• Ultrabooks (ZenBook Pro): 10,000–20,000 ₽ (due to the complexity of disassembly).

Original batteries last longer, but their price can reach 70% of the cost of a new laptop.

Can I use a laptop without a CMOS battery?

Technically yes, but this is inconvenient: every time you turn on the BIOS settings (time, boot priority, TPM parameters) will be reset. In addition, without a battery, the laptop may not wake up from sleep or hibernation mode. If you temporarily removed the battery to reset the BIOS, install it back as soon as possible.