Battery indicator delays updating the recent charge status. give it some moments of ride or read battery voltage when system is ON, on page 3 of screen by double clicking the middle button. Above 41V for 36V nominal systems is considered full. For 48V systems above 53V is considered full.

Green LED may turn on when charger is plugged to battery only without being connected to wall.

Try different wall plugs.

Try different charger cable cords.

Unplug charger from wall, connect charger to battery first then plug the charger to the wall.