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Where can I get replacement for laptop batteries?

I have got hp laptop for last 13 months. Now there is problem. It is always showing one message that the batteries are in poor condition. Can someone tell me what exactly the problem is? Or this is just normal? What happens if I don’t replace the batteries? Will the laptop stop working? Also tell me how long do these laptop batteries last generally? And if I have to change the batteries then tell me the places in New York where I can get the replacement for laptop batteries? Thanks.