PiTop 4 Battery won't charge pi-top battery show's no low capacity

Batteries should last a lot longer then this… I have a PiTop 4 that will not charge.

pi@pi-top:~ $ pi-top battery
Charging State: 1
Capacity: 14
Time Remaining: 0
Wattage: 0

How do I force the PiTop4 to charge the battery ?

Judging by other threads it looks as if the battery cannot be replaced, which is an annoyance.

I can’t find any support material to resolve this. The device did not get past 20% or so recently and now will not start. I’ve removed the Pi 4 front the Top and that works fine, it’s just the base unit which is causing the issues.

Any advice gratefully appreciated.