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最好用小電流檔,也就是1檔,進行慢充.充三四個小時就完全充滿了.
解法1:12V×7AH=84W·H 84W·H÷55W≈1.53H 解法2:55W÷12V≈4.58A 7AH÷4.58A≈1.53H
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