Pinebook Pro never charge to 100%

[bcnaz]

I have following problem: My Pinebook Pro with the default OS never charge to 100%. So, when it is connected with the 5v charger, when I put the mouse on battery icon, the maximal percentage what I can see is 93% ("Laptop battery charging (93.0%)"). Do someone know if this is a hardware or software problem? And are there another people who have similar problem?

 Yep,  I have an original ISO  and the recent ANSI  they both charge to 99%..

But that is close enough,  I am not certain how accurate that is anyhow.

No problems with run time and they seem to hold their charge for a long time sitting on the shelf.

From what I understand it is the more discharge and recharge cycles they go through,
    .....     the more accurate the indicator gets.