iPhone not charging battery or is seing battery as dead

After replacing the digitizer and reassembly (NB the iphone was sitting unused for a whole month) i noticed my iphone battery life would sometime go up or down while charging until it was completely dead, so i let it sit and charge for about a half a day it only charged to 40% and wouldn`t charge any further it just kept draining so i went ahead and took out ye ole multimeter and tested, the voltage of the battery connector is 1.19 volts while the iphone is plugged in without the battery (im a little concerned as to that being the voltage that should be provided) and the battery itself is spitting of around 2.98- 3 volts that`s quite good i guess if its supposed to be 3.7 fully charged. I tested 3 parts (that i saw on another post, the 2 fuses and that chip looking diode i think) where the dock connector connects to the logic board they seem fine. Now i`m wondering what could be the problem is it the battery that has gone bad, i got a bad dock connector, bad IC, bad charger cable or is there something causing the iphone to think the battery is dead when it has life?