@nigelbm
Thank you for posting on the HP Support Community.
I would request you to contact our Support and our Support Engineers should be able to check the appropriate replacement battery for your HP slate,
HP Support can be reached by clicking on the following link: www.hp.com/contacthp/
Please feel free to contact us here anytime you need any further assistance. Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
ECHO_LAKE
I am an HP Employee