My MacBook keeps crashing after I replaced my battery
I have a MacBook Pro Retina mid 2012. About 2 weeks ago I replaced the battery with a new one (from iFixit's website) since the old battery became really weak.
After I replaced the battery the MacBook did work, but sometimes it wouldn't start-up when it was off and charging for a while. A few times the MacBook also turned itself off when it was closed for a while (even though the battery was almost completely full).
Yesterday I saw that there was an update available for a new macOS, so I tried to update my MacBook (maybe the problems were software related, and if not, it would still be smart to update the OS, I thought). But after it turned itself off and on to start the updating process the booting sequence keeps looping. When you turn the MacBook on I have the fill in my password and after that it waits for a few seconds and than turns itself off and on again. Repeating the loop.
Here is a video of the problem: https://m.youtube.com/watch?v=_Kx0LGWZOa...
Does any you have any idea what might be causing these problems? I have looked online but I couldn't find any MacBook with the similar problem. :s
Thank you, and kind regards from the Netherlands,