Macbook resetting itself when the battery dies.

Hi all I am really hoping someone can shed some light on what’s happening to my Looney MacBook.
About two days ago I forgot to put it on charge when the battery was on 3% and it shut down, so I turned it back on when I had connected it to the power like normal and expected all to be okay. The computer had completely reset itself, time, date, Internet passwords, background everything. I put everything back to how it should and tried to connect to Facebook. The webpage was just the raw webpage, without its style sheet (is the only way I can describe it). So I was like okay that’s weird, and normally after a few refreshes it goes back to normal but it didn’t. It wasn’t because the Internet connection was slow either. 
The next day it was still the same, deleted the cache reset everything on safari and restarted which seemed to fix it. I have just let the battery run down again (bad I know) and it did it all over again.
So I am turning to here to figure out what is going on! I hope it can be fixed, as I love my mac too much!
Appreciate any help!
Thanks

The next day it was still the same, deleted the cache reset everything on safari and restarted which seemed to fix it. I have just let the battery run down again (bad I know) and it did it all over again.
If you love your Mac, stop running its battery down the the point that it shuts off.

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