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Lithium ion battery cells need to remain above a certain voltage level to not get bad. I assume within your 1 year of not using it the charge level dropped and it killed the battery so you will have to replace it.

Check your battery model on ebay and in most cases you will find a cheap replacement one and it shouldn't cost as much as the value of any laptop bought last year. That is assuming the battery is easily serviceable and you don't need a tech.