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Grammar detail: っぱなし

っぱなし - leaving ~ on, still in use
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verb stem
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っぱなし
is used to describe something left in a state of being on or used. For example:
water running(
みず
を)
しっぱなし
electricity / light on(
でんき
電気
/
でんとう
電灯
を)
けっぱなし
windows open(
まど
を)
けっぱなし
cord connected(
でんげん
電源
コードを)
つな
ぎっぱなし
でんげん
電源
コード
つな
ぎっぱなし
して
しゅうしん
就寝
する
ひと
おお
おも
います
ひゃく
100
%
えている
じょうたい
状態
さらに
じゅうでん
充電
つづ
ける
バッテリー
れっか
劣化
しんこう
進行
させてしまいます

I know that there are many people who leave the cord plugged in and go to sleep, but if you continue to charge the phone when it's over 100%, this will cause steady deterioration of the battery.
This form of the verb functions as an adjective, so the most typical usage is:
[object] を [〜っぱなし] にする (to leave something in a ~ state of being)
This form typically operates on a transitive form of a verb. So for example compare:
  • まど
    ひら
    いている (the window is open)
  • まど
    けっぱなしにした (I left the window open)
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Kanji used in this grammar

スイ   みず water   
シュツ   スイ   だ to take out, to put out   で to go out, to exit   
デン    electricity   
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キ   ケ    spirit   
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トウ   ひ lamp   
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テン    spot, point   
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ソウ   まど window   
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カイ   あ to (be) open   あける    ひら to open (something)   ひらける to open out (eg view)   
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ゲン   みなもと source, origin   
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つな to connect, to join (hands etc)   
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シュウ   ジュ   employed   つ to be employed, take (a seat)   つける to employ   
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シン   ねかす to lay down   ね to sleep, to lie down   
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ジン   ニン   ひと person   
タ   おお many   
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シ   おも to think   
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チョウ   こ    こえる to exceed   
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ジョウ    condition, circumstances   
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タイ    condition, appearance   
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ジュウ   あてる to allot   
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ゾク   つづ to continue   つづける to carry on with   
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レツ   inferior   おと to be inferior to   
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カ   ケ   ばける to change   
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シン   すす to advance   すすめる to promote, push   
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コウ   ギョウ   アン   ゆ    い to go   おこな to take place   
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