For a number of weeks my 1 1/2 year old Varia Rear radar camera light was taking forever to fully charge, and eventually would show less than 1/2 charged after significant charging.
At first I thought it was the Unit itself, but did a number of tests before reaching out to Garmin for a replacement battery or unit.
I swapped out my USB power adapter with a new one… still the same problem.
I used the same cable to connect my Varia to my MacBook Pro computer and although it would start to show it was changing, the Mac would keep showing the Varia hard drive was incorrectly disconnecting from my Mac! Significant clue? Yup!
It turned out to be the original USB-A to USB-C black cable that came with the unit. Further testing? Yes. For when I used that cable with my Garmin Edge to charge it, the Edge also wouldn’t fully charge either.
So if you’re having the same trouble with any Garmin units failing to charge, it may be your original Garmin cables may be the reason for falling to charge your unit.
I hope this is helpful for those of you with a similar issue.