i feel like taking my labtop outsaid

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i want to take my labtop out said with me but my battier will nt hold up what do you think i need to do i want to knw can you tell me and if i buy i new batter it coast to much and when i got it he take it off the shelf and i wanted one from the back and they give me one off the shelf he gave a model one so do you think it is to late to take it back