Wireless flash drive....How long will a charge hold when not in use

I charged my flash drive last week. On the instructions it says that you should see the orange light on and it shuts off when charged. I have never seen the orange light when charging. I put the drive to USB port to charge last night and ipad app shows it is not fully charged. I need this for my college class in two days.

how long did you charge it? does the app show a change in battery level? try other USB ports or an AC charger if you have one. 

Hi Angel, so which one worked here? Using other USB port or another adapter?