Hey! We can troubleshoot your Asus computer system battery warning safely — no opening the laptop, no risky firmware steps, and no “random cleanup” tools.

First, I want to pin down which warning you’re seeing, because “battery warning” can mean very different things:
• Windows low battery notification (battery low / critical battery / sudden shutdown)
• A “service/replace battery” style warning (battery health degraded, wear, capacity drop)
• Charging warning (plugged in not charging, power adapter not recognized, slow charging)
• BIOS/UEFI message (system-level battery alert before Windows loads)

Quick questions — answer in any order:
1) What’s the exact wording (or closest wording) of the warning?
2) Which Asus model and Windows version (Windows 10/11)?
3) Is it happening while plugged in, on battery, or both?

Got it — “needs attention” + faster drop usually points to either battery wear (normal aging) or a charging/reading mismatch (Windows and the battery controller disagreeing).

Before we assume it’s a failing battery, I like to run two safe reality checks:
1) Charging behavior check: When you plug in the charger, does Windows show “charging” and does the battery percentage increase steadily over time?
2) Adapter/port clue: Do you use the original Asus charger, and is it USB-C charging or barrel connector? (A loose connector can cause “connected but flaky” power.)

Also: did this start after any change — new charger, Windows update, travel, or leaving it plugged in most of the time?

The “stuck near 80%” detail matters. On many Asus laptops, that can be normal if Battery Health Charging is enabled (it intentionally limits maximum charge to help lifespan). That’s not a failure by itself — but it can confuse people because it looks like the battery “won’t fill.”

The fast drop (40% → 15%) could be wear, or it could be the battery gauge being out of sync. So we should separate: charge limit vs capacity/wear vs reading accuracy.

Safe checks (no changes yet):
• Do you have the MyASUS app installed? If yes, does it mention Battery Health Charging modes (60% / 80% / Full Capacity)?
• When the warning appears, is it a Windows toast notification, a MyASUS message, or something that looks like a BIOS/system prompt?

And one small “risk check”: does the laptop ever shut down suddenly, or is it just warnings and faster drain?

That’s actually a pretty common pattern for a laptop that’s plugged in a lot: the battery health features protect the battery, but the effective runtime can still feel worse over time if the battery is aging or if Windows’ estimate is off.

Here’s the safe logic I use to avoid guessing:
Step A — Confirm whether the 80% behavior is intentional.
In MyASUS, if Battery Health Charging is set to an 80% mode, that explains the “stuck” charge. Not a defect — it’s a limit.

Step B — Measure wear vs confusion (no repair steps yet).
Windows can generate a battery report that compares Design Capacity (when new) vs Full Charge Capacity (now). If Full Charge Capacity is much lower, that supports battery wear. If it’s close, then the warning might be triggered by settings, a reading mismatch, or power plan thresholds.

If you want to browse general troubleshooting topics, here’s the main hub: Computer Troubleshooting.
And if you’ve noticed other “after update” quirks (hangs/restarts), these can be relevant too: keeps asking to restart and error repeats after restart.

“Needs attention” usually means the system thinks the battery isn’t behaving as expected — that can be wear, a calibration/reading mismatch, or charging not reaching the target it expects. It doesn’t automatically mean “danger,” especially since you’re not getting heat/swelling symptoms and it’s not shutting off suddenly.

The BIOS update message you mentioned is also normal: many BIOS/firmware updaters require the battery to be above a certain level and the charger connected. That warning is there to prevent a firmware update from being interrupted — it’s not necessarily a battery failure message.

Safe checks I’d do next (still diagnostic, not “fixes”):
• Look for any physical red flags: swelling trackpad, bulging bottom cover, unusual heat or smell. (If any of these exist, stop and get service.)
• In MyASUS, note whether charging is limited to 60/80% on purpose.
• Run a battery report to see the capacity numbers — that’s the cleanest way to decide whether this is mostly aging or mostly settings/estimates.

One more detail: when it drops fast (40% → 15%), is the laptop under heavy load (gaming/video calls), or just web browsing?

Perfect — that already explains one “mystery”: the 80% plateau is a feature, not a fault.

To avoid wasting time, I’d prioritize checks that answer a yes/no question:
1) Is the battery actually worn? The battery report tells you by comparing capacity now vs when new. That’s the most objective clue.
2) Is Windows triggering warnings because of thresholds/settings? Sometimes “battery warning” behavior is influenced by power plan settings, notification settings, or how Windows estimates remaining time.
3) Is charging stable? If it always charges normally to the set limit (80%) and holds steady, that reduces suspicion of an adapter/port problem.

If you’re seeing other system oddities along with battery warnings (freezes, random restarts), that can overlap with power management too — this article can be a quick cross-check: needs frequent restart.

Once you have the battery report numbers (Design Capacity vs Full Charge Capacity), you’ll know whether the warning is “expected aging” or something else worth digging into.