Windows 10: Laptop charges to 79% and stops charging

I've noticed that my battery has stopped charging at 79%. I generated a battery report for my laptop, but the report kept saying the maximum battery life is 79%. Later, I uninstalled the Microsft AC Adapter and Microsoft ACPI Complaint Control Method Battery to see if that will help. It did, but then the battery icon disappeared, and I could not find where to enable it. Luckily, it was automatically installed back into Device Manager. My charging light is white if it is a full battery, and red when it is 99% and lower. On startup, it shows white, but for the short seconds where I type in my PI

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Why is my laptop battery charge topping at 79%?

This pertains to a 2 1/2 year old HP laptop.

I run it plugged in most of the time, but once a week I'll start the day unplugging it, and leaving it unplugged until it gets down below 10%, which usually takes about 5-6 hours.

Late last week, I got a Windows notification I'd never seen before, which I now can't quote verbatim, but it suggested using "battery optimizer" - I think that's what it was called - to "optimize" my battery. Hey, why not?

Except that

1. The next time I ran the computer unplugged, the battery drained to my needing to plug it in, in about four hours. Much faster than usual.
2. Then today I noticed that my battery was only 79% charged, though plugged in.

Below is a shot of my battery graphic:





Having been plugged in more than a day ago, it should be at, and holding at, 100%.

So how do I get the battery back to 100% charged? Is doing so advisable or not? What's a true "optimum" setting for the battery?

In asking the "optimum" question, I've never had a performance problem/issue with the computer; my main goal is that, when it is running on battery, it runs for as long as possible.

 

battery not charging for after 79%

my laptop battery charging maxi 79%. After showing 80% available ( plugged in not charging) what is the reason? how to solve

 

Why is my laptop battery charge topping at 79%?

For my phone, I essentially do this. I never charge it to 100%; usually just plug it in in my car, and it sits between 40-80% most of the time because of this.

But I use my laptop more like a desktop - in fact, it's not been moved in 2 1/2 years. Unplugging it and plugging it in, to maintain some desired charge range, probably isn't practical.

So with that in mind, that the laptop is only unplugged for the purpose of giving the battery a chance to work - what suggestions would you have for me, relative to my original post?