Laptop Battery Meter Wrong?

My battery meter is horrible wrong. Just the other night it jumped from 70% charged to 100% charged, and then stayed at 100% for about an hour, and then jumped down to 30%. It is incorrect.
I figured it just needed to be calibrated, so I charged it to 100% but it keeps showing wrong percentages.
What's going on with my battery meter? Why is it displaying the wrong battery charge amount?

Have you searched the laptop manufacturer's website? It sounds to me like a hardware problem rather than a software problem.
My battery meter was wrong a few months ago and the only solution was to take the laptop to the technician. Nothing I could do for myself.

I have the exact same problem with my laptop battery meter.
I thought that it was a minor problem that I was going to be able to fix myself but I'm noticing that it is something more serious and that I will need to take it to repair.
Something I was trying to avoid since I need my laptop to work.