Computer reboots when battery is critically low

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http://askubuntu.com – I am using Uubntu 12.04, and I've noticed that the computer reboots instead of suspending when the battery is critically low. It appears that this only happens when my laptop is unplugged. After rebooting once, the computers keeps rebooting until it is either plugged in or until it loses power. What is the usual cause of this issue, and how can it be resolved? (HowTos)