why does my laptop only works when plugged in

6:10

2:25

2:17

5:07

1:28

3:00

3:30

2:14

7:33

2:21

2:43

11:08

2:12

14:55

1:18

2:30

10:29

5:13

7:12

8:25

00:48

3:49

6:05

7:50

7:25

8:12

2:51

1:57

10:04

3:37

4:20

2:56

1:37

12:50

2:01

1:56

13:59

3:41

1:38

2:32

3:03

2:22

5:04

3:42

5:30

2:55

4:43

4:02

5:20

3:25

4:19

4:43

2:32

2:37

2:03

5:28

1:49

5:35

3:16

2:25