My newly replaced battery has stopped working after two weeks
About two weeks ago I replaced my Mac's battery using the ifixit replacement battery and kit. It seemed to have worked as the laptop ran perfectly until last week, when it suddenly did not work unless plugged in. The battery sign had an x over it and stopped appearing in the menu bar completely. I reset the SMC but that did not work so I opened it up to see if anything had moved around but everything appeared to be in place and still secure, (see attached photo). Can anyone suggest what to do next?