20 minute charge needed to reboot MBP after battery is completely drained

When my battery runs out and I connect the charger my MBP does not immediately reboot. It will not boot until the battery has been charged for 20-30 minutes. This just started recently. Anything I can do to fix this? Thanks

Normally when the computer shuts down when the battery runs out it actually retains some charge so it can shut everything down. It may be that your battery is actually getting to the point the computer thinks there is enough residual charge to shut down when in fact it is actually less. So it has to charge for 20 mins before it will reboot. Just a theory mind you. Have you carried out a 'calibration' of your battery recently? If not try a battery 'calibration' take a look here:
http://support.apple.com/kb/HT1490
Phil

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