Hi @hifiguy ,
Here’s a link to the [http://h10032.www1.hp.com/ctg/Manual/c04581124|service manual] for your laptop, taken from this [https://support.hp.com/us-en/product/hp-pavilion-13-a000-x360-convertible-pc/6936239/model/7200476/manuals|webpage]
Scroll to p.38 to view the necessary pre-requisite steps and then the procedure to remove/replace the battery.
Also on p.38 you’ll find the spare part number for the battery. If you search online using the part number ''only'' you’ll get results for suppliers of the part.
Hopefully this is of some help.