HI SB. I'm Greg, an installation specialist, 10 year Windows MVP, and Volunteer Moderator here to help you.
Just to be sure. You want to press once the Power button and NOT hold it to start up.
Try putting the battery back in. Does it start? Does it charge?
Try another charger. If you take it to a shop they will have a universal charger to plug it in to see if that works. If so they can sell you one or give you the exact specs to order online. In the US the shop which does this easily and for free is Geek Squad.
If the battery doesn't charge then See these fixes for Battery Not Charging:
https://www.groovypost.com/howto/troubleshoot-b...
https://www.kapilarya.com/fix-battery-plugged-i...
Check the manufacturer's Support web page for your full model number to see if there is a battery issue or recall for it. Remember you have a full one year warranty for PC and parts replacement or repair so I'd use it if still available.
Run the battery re-calibration here: https://www.howtogeek.com/172271/how-to-calibra...
Then generate a battery report and post it back here: https://www.groovypost.com/howto/generate-batte...
Right click Start to open Device Manager, under Battery choose the battery device, then Driver tab, then if available Roll Back the driver. If not available, choose Uninstall Driver, restart PC to reinstall.
If this was caused by Windows Updates then you can check which were installed at Settings>Update & Security>Windows Update under Installed Updates, then uninstall them from the link there, and hide with the Hide Updates tool downloaded from here: http://download.microsoft.com/download/f/2/2/f2...
You can also use System Restore to get before the problem began, then check for Updates with the Hide Update tool and hide them: http://home.bt.com/tech-gadgets/computing/how-t...
If this was caused by a Version Update then for 10 days you can roll it back in Settings>Update & Security>Recovery and then hide it until it matures using the Hide Updates Tool which is explained more here:
https://www.howtogeek.com/223864/how-to-uninsta....
If nothing else helps then you might need to replace the battery. However I will tell you that most OEM after-market batteries and chargers have problems so I would only buy the official manufacturer's battery from the PC maker to be sure.
I hope this helps. Feel free to ask back any questions and keep me posted. If you'll wait to rate whether my post helped you, I will keep working with you until it's resolved.
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