[Dryhte]

Don't worry about this, until after you've used to reader a few months (and charged it from around 20% to full a few times).

You have to give batteries some time to 'break in', they seldom have their full capacity from the start. Also, sometimes the batteries don't report their voltages very accurately. I don't put much stock in the percentages, I tend to view it this way:
- 100%-50%: weeks to go
- 50%-30%: if I planned a trip right now, I'd charge it first, otherwise, still good to go
- under 30% maybe I should consider charging it