Many hardware questions are really improved by knowing the exact model but that is really hard to manage. It sure would be good to at least demarcate the huge hardware differences between a unibody portable and a non-unibody model.
The battery care and lifespans are drastically different. General assumptions on graphics, chipsets and motherboard features can be generalized better with more detail on the models.
Just a thought and a request to consider those tags to help the site.