Chosen Solution

I replaced my battery and after installation and full charge, the laptop will power off once AC power is unplugged. Laptop will not turn on if it is not plugged in. Most recent BIOS is installed.

Hi, Create a Win 10 battery report and see what it says about the battery. Did you get an OEM replacement battery or just a generic brand deemed as suitable for the laptop model? What is the full model number of the laptop?

When batteries are made they’re sent to a warehouse until sold. So they’re “New" because they haven’t been used but they’re not charged while waiting to be sold and discharging. Overall a new battery will fix the issue. My recommendation go to a Battery Store such as Batteries Plus Bulbs. They’ll get there batteries fresh each month and maintain them as well as they’ll come with warranties. You’ll pay more but it’s cheaper than a new laptop.