Chosen Solution
I just installed a new battery into my MacBook Air and after screwing everything in and rebooting, the battery icon isn’t present in the status bar and if I remove the adapter the computer shuts down. I reset the SMC and PRAM and no success. Should I reopen it and if so what should I look to do? Update (03/15/2018)
Here it is - does this mean I should reopen it?
Sounds like you either have a bad battery or the battery connection is not secured completely. Lets see what CoconutBattery shows. Paste a screenshot here for us to see. Adding images to an existing question