ASUS C31N1905 50Wh Long Battery Replacement Guide for Australian & New Zealand Users
When your ASUS VivoBook starts losing its charge faster than expected, it’s time to consider a genuine replacement battery. Our comprehensive guide helps you identify compatibility, recognise replacement signs, and install your new ASUS C31N1905 50Wh Long Battery with confidence.
Battery models & part numbers
| Reference / P/N |
|---|
| Asus-C31N1905-50Wh-Long |
Compatible models
| Model |
|---|
| Asus VivoBook 13 X321JQ |
| Asus VivoBook 17 F1704ZA |
| Asus VivoBook 17X M1703QA-AU009W |
| Asus VivoBook 17X S1703QA-DS71 |
| Asus VivoBook 17X S1704ZA-BX026W |
| Asus VivoBook Pro 14 OLED M3400QA-KM702WS |
| Asus VivoBook Pro 15 KM3500QA LNF511 |
| Asus VivoBook Pro 15 OLED M3500QA-L1191W |
| Asus VivoBook S15 D533IA-BQ013TS |
| Asus VivoBook S15 D533IA-BQ171T |
| Asus VivoBook S15 K533EA-BN238T |
| Asus VivoBook S15 M533IA-WB723T |
| Asus VivoBook S15 S533EQ-APC1625T |
| Asus VivoBook S15 S533FA-BQ001T |
| Asus VivoBook S15 S533FL-BQ022T |
Introduction
Your ASUS VivoBook is designed for mobility and performance, but even the best laptops experience battery degradation over time. The ASUS C31N1905 50Wh Long Battery serves as the power source for multiple VivoBook models across different series, ensuring you maintain the portability and reliability your device was built for. Understanding when and how to replace your battery can save you from unexpected downtime and frustration.
Common signs you need a replacement
| Symptom | Cause | Verification | Recommendation |
|---|---|---|---|
| Reduced battery life | Normal chemical degradation over 300-500 charge cycles | Check Windows Battery Report or ASUS Battery Health Charging | Replace when capacity drops below 60% |
| Laptop shutting down unexpectedly | Voltage drops under load causing protection circuit activation | Monitor shutdowns at specific charge levels (e.g., 20-30%) | Immediate replacement recommended |
| Battery not charging to 100% | Individual cell failure or charge circuit issues | Check charging status in Windows or ASUS software | Replace if stuck below 80% capacity |
| Physical swelling or bulging | Gas buildup from internal chemical reactions | Visual inspection of battery compartment | Replace immediately – safety hazard |
| Overheating during charging | Increased internal resistance | Monitor temperature with HWMonitor or similar tools | Replace if consistently above 45°C |
How to check compatibility
Finding your exact ASUS VivoBook model is crucial for battery compatibility. Look for the model number on the bottom case sticker, typically near the serial number and regulatory markings. For VivoBook 13, 17, and 17X models, the designation appears as “X321JQ” or “F1704ZA” format. VivoBook Pro models show “M3400QA” or “KM3500QA” patterns, while VivoBook S15 variants use “D533IA”, “K533EA”, “M533IA”, or “S533” prefixes.
ASUS provides official support through their website where you can enter your serial number to verify compatible accessories. The MyASUS app also includes hardware diagnostics that can confirm your current battery specifications. Remember that physical compatibility extends beyond just electrical specifications – the C31N1905 battery must fit your specific VivoBook chassis design.
When to replace
Battery replacement timing depends on your usage patterns and performance requirements. Most ASUS VivoBook batteries maintain reasonable performance for 2-3 years with typical use. Consider replacement when your battery lasts less than 2 hours for standard productivity tasks, shows consistent swelling, or causes system instability. If you rely on your laptop for mobile work or study, proactive replacement at the first signs of degradation ensures uninterrupted productivity.
Installation guide
Replacing your ASUS VivoBook battery requires careful preparation and the right tools. Begin by completely shutting down your laptop and disconnecting all peripherals. You’ll need a Phillips #00 screwdriver and a plastic spudger or guitar pick for prying. Ground yourself to prevent static discharge that could damage internal components.
For most VivoBook models, start by removing the bottom case screws – note that some may be hidden under rubber feet. Carefully pry the bottom case starting from the corners, working your way around the perimeter. Once inside, locate the battery connector near the centre or edge of the motherboard. Gently pull the connector straight up to disconnect, then remove the screws securing the battery to the chassis.
Install your new C31N1905 battery by reversing this process: secure with screws, reconnect the battery cable, and reassemble the bottom case. Power on your laptop and allow the system to recognise the new battery. Complete a full charge cycle to calibrate the battery monitoring system.
Usage & care tips
Maximise your new ASUS battery’s lifespan with proper care. Avoid frequent full discharges – lithium-ion batteries prefer partial discharges between 20-80%. Use ASUS Battery Health Charging software to limit maximum charge to 60-80% when primarily using AC power. Store your laptop in temperatures between 10°C and 35°C, avoiding extreme heat or cold that accelerates degradation.
For VivoBook Pro models with OLED displays, be mindful that these screens consume more power. Adjust brightness settings and use dark mode where possible to extend battery life. Regular calibration (full discharge followed by complete charge) every 2-3 months helps maintain accurate battery percentage readings.
Safety & recycling in AU/NZ
Battery safety is paramount in Australia and New Zealand. Never attempt to open, puncture, or modify lithium-ion batteries. If your battery shows signs of swelling, stop using it immediately and contact a professional recycling centre. In Australia, take old batteries to authorised collection points at Officeworks, Battery World, or council recycling centres. New Zealand residents can use the Recycle Mate app to locate nearby drop-off locations.
Both countries have strict regulations about battery disposal – never place lithium batteries in household bins due to fire risk. Many retailers offer take-back programs when you purchase a replacement battery. Proper recycling ensures valuable materials are recovered and hazardous components are handled safely.
FAQ
How long does the ASUS C31N1905 battery typically last?
With normal use, expect 2-4 hours depending on your VivoBook model and usage intensity. VivoBook Pro models with discrete graphics and OLED displays may see shorter runtime under heavy loads.
Will replacing my battery void my ASUS warranty?
In Australia and New Zealand, consumer law protects your right to have repairs done by third parties without voiding warranty, provided the repair doesn’t cause damage. However, any damage resulting from improper installation may not be covered.
How do I know if my battery is genuine ASUS?
Genuine ASUS batteries feature proper branding, correct model numbering, and come in official packaging. Purchase from authorised resellers and verify authenticity through ASUS’s support portal using the battery’s serial number.
Can I use my laptop while charging the new battery?
Yes, modern ASUS VivoBooks support pass-through charging, allowing use while charging. The system intelligently manages power distribution between operation and battery charging.
What should I do if my new battery isn’t recognised?
First, ensure the battery connector is fully seated. Try resetting the EC (Embedded Controller) by holding the power button for 40 seconds with the battery and AC adapter disconnected. If issues persist, contact the supplier for assistance.
Is the C31N1905 compatible with VivoBook models not listed?
No, battery compatibility is specific to chassis design and power requirements. Using an incompatible battery can damage your laptop and poses safety risks. Always verify against the official compatibility list.
How should I store my old battery before recycling?
Place electrical tape over the terminals and store in a cool, dry place away from flammable materials. Most recycling centres accept batteries for up to 12 months after removal.