Hi Michael, ask, have you allowed the battery to charge properly?
Leave it plugged in, for the term of 12 hours, you would have to have a light that indicates charging status
Then use it, until again it runs out of battery, again leave it 12 hours charging and should, work well
Take the tests and comment
If you can not make it work well, you should have the option to change the product, if it is new, in the store where you bought it
I hope it works properly
Greetings Franco Dosil
https://fccid.io/2AE6GALP-XP850/User-Manual/user-manual-4144324.pdf