Is there any danger/risk in leaving my iMac G5 turned off and disconnected for long periods of time?

As the title states, is there any danger in leaving my **iMac G5** (Later 2005 model) turned off and disconnected from a power outlet for long periods of time? I will be traveling for roughly 1 month and, during a normal week, I only intend to use it a couple of times a week. Otherwise, it will sit in my room under a full dust cover, disconnected from a power outlet. Is there any risk to this? Specifically- could doing this alone damage the battery/system components/screen as it would damage a portable battery powered device such as an iPad or iPhone (where the battery must be charged and discharged at a fairly consistent rate)?