Garmin Rino - Recent Questions, Troubleshooting & Support

I would return it to Garmin for a repair.

the battery inside is dead, this will cause the date to be wrong; just like the same thing on real computers. the clock in side is RTC time clock chip and needs power to work. power = battery. #1 all time failure on any portable device is batteries. you could ask them directly at https://buy.garmin.com/en-US/US/p/8523

if the light goes off it would indicate that the battery is fully charged. does the unit function like a phone when charging as in showing a chg indicator even if it is off? If so there are more serious issue than maybe just a bad power switch.

An older unit. No service available from Garmin as it is obsolete. The 120's have a lot of problems. Poor battery life. Poor reboot and constant dying after on. I would find another unit.

Go to Setup>Reset>Reset Trip Data, Timers, etc.

buy one : https://buy.garmin.com/en-US/US/shop-by-accessories/batteries/lithium-ion-battery-pack-rino-/prod1166_010-10569-00.html