If you want to review the words or sentences that have a discharging battery, you need to:
1. Go to the "You" tab.
2. Tap on "Review".
3. Choose what you want to review: Words or Sentences.
4. Tap on the "Forgotten" tab. 
5. Select one of the available options.
a) Discharging 1- the words/ sentences that haven't participated in games for more than 7 days
b) Discharging 2- the words/ sentences that haven't participated in games for more than 14 days
c) Discharging 3- the words/ sentences that haven't participated in games for more than 21 days
d) Discharged- the words/ sentences that haven't participated in games for more than 30 days
6. Tap on the "Review" button. 
Note: You need to learn at least one subtopic to be able to review by "Forgotten".
You can also watch our video tutorial on how to review the words or sentences that are discharging here.
What is a Review?
Why is the Review empty?
What is a word or sentence battery?