Sometimes, the battery alarm is set to high or off and it will automatically warn you when the battery is at a certain percentage. Most newer laptops will even warn you when the battery is going bad.
The AC cord is both the power cord and it will also charge the battery when plugged in as well.
So, it's safe to run on just battery as it may just be telling you that it doesn't have AC power and that you're running only on the battery. My Satellite laptop is setup to warn you when it's only on battery power as well.
You have a bad or loose DC connector on the system board:
Symptoms of a broken power jack
1. If you wiggle the power cord or the AC Adapter connector on the back of the laptop, the power LED and battery charge LED start to flicker.
2. Battery will not charge in the laptop.
3. Laptop runs fine off a charged battery.
4. With the AC Adapter connected the laptop appears to be dead.
No power LED or battery charge LED activity.
5. Laptop randomly powers off without any warning.
If your laptop is out of warranty, then you can fix the problem by resoldering DC-IN jack on the system board. If it
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