Macbook goes into coma after battery drained

After going to sleep and closing my MBP lid last night which had very little power left I was expecting it to have completely drained when I opened it this morning. However, when I opened the lid (and connected the power) and tried to press the power button on nothing happend, tried different keyboard combinations with no luck aswell. The machine had completely died and there was no power to it. Taking the battery out etc didn't help either. I thought the macbook had just become an expensive paperweight. But... 20mins or so later is mysteriously powered back on restoring the session. I have repeated this again by draining the power and it does it each time, sometimes restoring the session a bit fast from 5mins to 25mins. Any ideas what is going on here?

This often happens. After a complete discharge of a battery you need to let the battery get some charge before the system will let you boot.
The reason is simple, the MBP on maximum load actually tops its power requirements from the battery. While it is very small and momentary it does happen. If it's fully discharges your MBP can't do this. And, one of the times your MBP is under heavily load is at boot time which is why it won't boot without a battery.

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