crwdns2934241:0crwdne2934241:0 Muhammad Hunain

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Calculator not working properly

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I have casio fx99ies plus calculator. 3 days earlier i was using it when it turned off then i replaced its lithium battery but it won't start then i noticed that when i press the battery hardly it starts but when i release it, it stops . Kindly tell a solution to this problem

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Casio FX-991ES Plus

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open