Chosen Solution
So I bought iPhone which came with original battery that said it had 80% health but I could use it maximum 30 min and replaced it with replacement battery but life on this battery isnt very good either. If I leave disconnected from charger at night in the morning its dead so even when its not doing anything its discharging. When the battery drops below 25% its start to lag and its unusable actually and sometimes this percentage at when its starts to lag varys, also now it lags when it has 60%. Does anybody know what could it be?
Sounds like charging chip if it wont charge with original cable (make sure that cable works on another iPhone) but the lagging sounds like bad quality batteries.
Tristar failure is a really good candidate for this problem, or you may have some corrosion on the logic board that is causing a partial short resulting in a low level current leak. Either way—these are microsoldering problems and it is time for a trip to your friendly local microsoldering/board repair shop.
