Well, you have to live with that because HP does not stock all batteries, very expensive to do business that way. Given there are hundreds of HP 15 models/products, you need the right part # otherwise it won't work .
Please use the following way to find out the model/product of your machine
Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".