Asus VivoBook 14 / VivoBook 15 X512 42Wh 3-Cell Battery (C31N1818)

Asus VivoBook 14 / VivoBook 15 X512 42Wh 3-Cell Battery (C31N1818) — quick answer

The Asus VivoBook 14 / VivoBook 15 X512 42Wh 3-Cell Battery (C31N1818) is a genuine, bench-tested Asus replacement battery available at N.N Laptops, Hafeez Center, Lahore for Rs. 8,499. It's a 42Wh 3-cell internal pack rated at 11.52V and fits VivoBook 14 X412, VivoBook 15 X512, VivoBook S15 S532, and VivoBook S14 S432. Comes with our 30-day check warranty plus Lahore delivery and nationwide delivery via TCS / Leopards. At Rs. 8,499, this 42Wh battery is one of the best value options for Asus VivoBook in Pakistan in 2026. Contact Sayam on WhatsApp 0314 4000131 to ask anything or get live photos.

Full specifications

Common part numbers include C31N1818, C31N1819, and C31N1820 — check your current battery's sticker.

Compatibility — which laptops does this battery fit?

This 42Wh 3-cell internal battery is a direct OEM replacement for the following Asus laptops:

• VivoBook 14 X412
• VivoBook 15 X512
• VivoBook S15 S532
• VivoBook S14 S432

Match the OEM part number on the sticker of your current battery before ordering. If your old battery part number isn't on this list but the laptop is, message us — there are often three or four interchangeable part numbers per chassis.

Battery health — what we test before shipping

Every battery on our shelf goes through a 5-point bench test before listing:

• Capacity — we measure actual usable Wh and only ship packs at 95%+ of rated capacity.
• Cycle count — read from the embedded BMS chip; we don't sell anything over 100 cycles.
• Cell balance — all 3-cell internal cells within 50mV of each other.
• Charge/discharge cycle — verified full cycle without thermal anomaly.
• Visual — no swelling, no bulging, no scorched contacts.

Every battery is bench-tested before shipping — we measure actual capacity, cycle count, and voltage balance.

Installation — how to swap the battery

Internal 3-cell batteries on modern Asus laptops require opening the back panel (8-12 Phillips screws, sometimes Torx T5). Disconnect the AC adapter, unscrew the panel, locate the battery connector on the board, gently lift the ribbon connector latch, unscrew the battery hold-down screws, lift out the old pack, and reverse the steps with the new one. Total time: 10-15 minutes.

Free installation in shop

If you're in Lahore, bring the laptop to Hafeez Center — installation is free with battery purchase. We'll also calibrate the new pack (full charge → full discharge → full charge) so Windows / macOS reads the correct capacity from day one.

Real-world battery life — what to expect

With this 42Wh pack and balanced Windows / macOS settings (70% brightness, Wi-Fi on, mixed use), expect:

• Web + Office work: 5-7 hours
• Video playback: 6-8 hours
• Code compilation / Photoshop: 2-3 hours
• Gaming or heavy GPU load: 60-90 minutes

These figures match Apple / Dell / HP / Lenovo published specs for the listed models. If your old battery was giving you 2 hours, the new one will restore the original full runtime.

Where to buy in Lahore — and warranty terms

Visit us at Shop 66A, 3rd Floor, Hafeez Center, Gulberg III, Lahore. We test the new pack on your laptop before you pay — if Windows / macOS reads the correct cycle count and design capacity, you walk out happy. Lahore deliveries are free; nationwide via TCS / Leopards covers Karachi, Islamabad, Faisalabad, Multan, Peshawar, Sialkot in 1-3 working days. WhatsApp 0314 4000131 to confirm stock or ask Sayam any questions.

Browse all our laptop batteries, laptop chargers, and complete laptop parts catalogue.

Warranty — what you're protected against

Every battery carries our 30-day check warranty. If the pack fails to charge, shows wrong capacity in Windows / macOS, drops below 85% of rated Wh in our diagnostic, or develops any swelling within 30 days, bring it back to the shop with the invoice for full replacement or refund. No questions asked within the warranty window.

Frequently asked questions

How long will the new battery last?

A fresh quality cell-pack should give you 400-600 full charge cycles (about 2-3 years of daily use) before noticeable capacity drop. Avoid leaving the laptop plugged in at 100% all day — keep it cycling between 40% and 85% for longest cell life.

Will the laptop recognise this battery in Windows / macOS?

Yes — every battery we sell is BMS-flashed with the correct cell-pack ID for the laptop, so Windows / Lenovo Vantage / Dell Power Manager / macOS Battery Health show full information including cycle count and design capacity. No 'plugged in, not charging' driver errors.

How much battery backup will I get on my VivoBook 14 X412?

With this 42Wh pack at default Windows balanced settings, expect 5-7 hours of mixed-use battery life (web, Office, video). Brightness at 70%, Wi-Fi on, no heavy GPU workload. Gaming or compiling drains in 90-120 minutes — that's normal for any laptop battery this size.

Is this a genuine OEM battery or aftermarket?

Our stock comes in both genuine Asus pulls (tested cells, original casing, often the higher price) and high-grade A-class compatible cells (tested for capacity at 95%+ of rated Wh). Tell us which you want on WhatsApp 0314 4000131 — both carry the same 30-day check warranty.

Why this battery is the right choice for your VivoBook

Many VivoBook users wonder whether to go for a 32Wh, 42Wh, or even a 48Wh upgrade. This 42Wh pack hits the sweet spot — it gives you a full workday of office and web use without adding extra weight. Compared to the base 32Wh, you get about 2 more hours of run time, and it's a direct drop-in replacement. If you're upgrading from a worn-out original, you'll notice the difference immediately. At Rs. 8,499, it's the most cost-effective way to revive your Asus VivoBook's battery life in 2026.

What customers say

Our customers in Lahore, Karachi, and Islamabad consistently report that after replacing their old battery with this 42Wh unit, their laptop runs 5-7 hours again — just like new. One customer mentioned his VivoBook X412 used to last barely 1.5 hours; after this swap, he gets 6 hours of browsing and video. We test every battery on our bench before listing, so you're getting a pack that we'd use ourselves.

Installation tips and in-shop service

If you're comfortable with a screwdriver, watch our quick video guide on YouTube or follow the steps above. But if you're in Lahore, bring it to Hafeez Center — Sayam will install it free and even calibrate the new battery for you. That way you leave with Windows showing 100% capacity and accurate battery time.

Pair with a charger

If your old charger is also failing, we stock genuine Asus adapters. Check our chargers section to complete your setup.

N.N Laptops — Shop 66A, 3rd Floor, Hafeez Center, Gulberg III, Lahore. WhatsApp / Call 0314 4000131. Lahore delivery, nationwide delivery via TCS / Leopards, 30-day check warranty. Contact Sayam on WhatsApp 0314 4000131 for any queries.