Will not startup unless I disconnect the battery

I'm having an strange issue with my macbook pro (2011- 2ghz i7). It runs fine while on a/c and on battery power. Problem occurs when I shut it down.
If I tell it to shut down it will not power back on until I remove the back plate and disconnect and reconnect the battery. Once I do this it seems to run fine.
I will note that my daughter tends to use it until the battery goes dead and on more than one occasion. The battery seems to hold a charge just fine it's just that the machine will not power on after a shutdown even while plugged in a/c and full battery.

David,
which version of OS X is installed on your MacBook Pro?
Try starting up in Safe mode, log in, and then shut down. Is your MacBook Pro able to power on without disconnecting the battery then?
If you have a bootable external drive, use Startup Manager to boot from the external drive, log in, and then shut down. Is your MacBook Pro able to power on without disconnecting the battery then?
For the sake of your MacBook Pro’s battery life, your daughter should start recharging its battery when it gets down to 20%.

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Will not startup unless I disconnect the battery

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