I suspect that this is the reason why MBPs now refuse to boot on low battery. You used to be able to start up the machine when your battery was at 0% (as long a

I suspect that this is the reason why MBPs now refuse to boot on low battery. You used to be able to start up the machine when your battery was at 0% (as long as you were plugged in), but newer MBPs complain and don't boot up until you recharge to 10% or so.