How do you know when GBA SP is fully charged?

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Tags

1. #inserted
2. #lower
3. #indicate
4. #adapter
5. #charging
6. #standard
7. #outlet
8. #swing
9. #light
10. #prongs
11. #battery
12. #lights
13. #charged
14. #insert
15. #indictor
16. #recharge
17. #fully
18. #indicator