My macbook kept forgetting it had a battery
My macbook would be running perfectly happily, both on battery & on mains, and then it would suddenly "forget" it had a battery. The indicator would say "no battery", the lights on the side of the macbook would all flash. Taking the battery out & putting it back in whilst the mac was running would fix it!
Without the guide, and the spudger, it would have been tricky... but with both of those things it was smooth sailing.
Nothing interesting to add, I just followed the guide :-)
The spudger is my new best friend!