On my Sony E-book reader the redlight comes on while it is charging, when it is charged the light goes out. I plug it in and look at it in a few hours or overnight. Likewise my phone, when the red light goes out it's charged.
Huawei P10 review
1995-2015: How technology has changed the world in 20 years
An overview: What leading creative agencies are doing to improve diversity
New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.