IPhone 4 won't charge even after bat.replace?

I have a iP4 and had an issue, that the battery wouldnt charge. There was this lightning symbol. Now I bought a new battery and it didn't fix the problem. As long as the battery was charged the phone worked, but now it is at the lightning symbol again. Any idea?

All the obvious stuff like testing with another cable/charger/port was done. My question is should the dock connector or rather the logic board be replaced next? Where are the charging electronics placed?

Check the battery mah, if its different with old battery change the battery try to buy same mah battery…

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