Now I remember, mine older garmin was the same.
Let it a night in the power to charge, battery is full.
Thanks

I have plugged in the power and leave it for long time. With power off, of the device. Or need the power on, the screen on?

Never used zumo xt, find box
Try starting up.
See low battery, led night charging.
Next day, still low battery.

I let it in box at 80%, a year or maybe 3, thought that's was li-ion battery.
Google, the zumo battery, looks that's still used a nickel-cadmium battery, that's need always the highest ...