Yes lets agree that it is about 90%.

I was thinking of trying to make my meter as actuate as possible, but then im afraid that it will use power doing it.
The way to make it more accurate is to make data points and then compare and make an estimate on power left

The "bad" thing with my meter is that i reacts to the voltage so it can fluctuate a bit, even on my 3000+ battery it can fluctuate by 10%