GT-i9060i : New batteries dying at 30% charger any tips?

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Android Central Question

Hello,

Replaced my three years old battery in my Samsung galaxy grand neo plus duos phone (GT-i9060i) that was little swollen, but otherwise worked well with no problems.

Problems started with the original replacement. Phone died there times in a row at 30%, upon being connected to charger showed 0% and refused to boot up. Returned this one as faulty and got replacement.

Sadly, the replacement did the same thing. Died at 20%, next time fast drop from 30% down to 4%, again died at 30 %. The voltage held well till 30 % but dropped to 3V right afterwards, taking the phone along. Upon charging, the curve skyrocketed straight up from 65% to 100% ( when charged from zero).

Running stock 4.4.4 but rooted (wanna use my SDcard without that stupid malware protection).

Was I too lucky to get two faulty batteries, or is my phone simply going haywire? :( anything I can do? Any tip will help me at this point...

Thank you all.
 

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