New battery not detected

Just replaced the battery in my HP Split 13-g210dx x2 (tablet part), running windows 10. No problems. Left it to charge with the dock / keyboard part overnight. After that, said battery 2 charged. Shut down and tried to start just the tablet. Nothing. Plugged in the tablet and started. Battery icon shows plugged in but X through the battery. Windows reports no battery present.

Any suggestions would be appreciated. Thanks.

PNW-HINGST-S19S4G1