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When my computer reaches 4% battery, Virtualbox shuts off. How can I disable this or change when it happens?

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The manual contains:

Battery Low The battery level reached a critical level (usually less than 5 percent charged).

This event is currently only handled on Windows hosts and Mac OS X hosts. When this event is generated, VirtualBox will save the state and terminate all VMs in preperation of a potential host power down.

The behavior can be configured. By executing the following command, no VM is saved:

 VBoxManage setextradata global "VBoxInternal2/SavestateOnBatteryLow" 0

This is a global setting as well as a per-VM setting. The per-VM value has higher precedence than the global value. The following command will save the state of all VMs but will not save the state of VM “foo”:

 VBoxManage setextradata global "VBoxInternal2/SavestateOnBatteryLow" 1
 VBoxManage setextradata "foo" "VBoxInternal2/SavestateOnBatteryLow" 0

The first line is actually not required as by default the savestate action is performed.

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