Well! Apparently I've not been charging this MG ZS EV correctly
It says in the manual to charge the car to 100% once a month & leave it plugged in to balance the main traction battery pack, The pulsating MG badge on the charging port pulsates when it's charging and will change to a steady light when finished charging & will stay lit until the balancing is complete, It will then go out when balancing is finished.
I think I've only done it once since getting it in January
We don't use the car everyday & I only charge it to 50-70% because of that so as not to leave the car sitting with a 100% charge for days.
I've just plugged it in now to charge to 100% & see if it goes into balance mode.