Lenovo K 900 --Battery charge indicator always shows 100 %

A strange issue after firmware upgrade in lenovo K 900 , When I charged to 100  % , the phone always shows 100 % charge . It is not getting updated and after using for 6-7 hrs the phone gets switched off without any notice . Now I can charge again and this time the battery charge indicator shows correctly . but again the same issue is seen if the phone is charged to 100 % .

Let it die all the way down, to recalibrate the battery, and then fully recharge.  See if that helps.

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