Along with cleaning the connectors, try this.
With the watch not connected, hold three buttons down (light, down and start buttons) for 15-20 seconds and try charging again.
I just finished chatting with Erica from Garmin Support Centre. The chat took less than 10 minutes and resulted in them sending me a refurbished watch, and I'll send in the defective one when I receive…
Mine wouldn't charge at ALL. I did your trick thinking it wouldn't work as there was no power left but it worked. Thank you!
This worked. Thanks a lot!
I had same problem and did the 3 buttons and it worked. Finally a response that works. Thank you.
thank you. that seemed to work. my watch is charging now.
The 3 buttons technics worked for me! Thanks
Worked for me also. Thanks!
Brilliant! That worked - thank you!!
I had the same issue, impossible to charge
I tried the 3 buttons but what worked for me was slight abrasion of all the 8 connectors with a metallic object, then immediately my watch started to charge again
Cool. Worked like a charm.
Still works! Thanks for the advice!
Nice of Erica.
I was less lucky - having a 4 year old 5 Plus with corroded contacts that doesn’t charge anymore.
The Garmin service told me that the watch is out of warranty, I can send it for repair, but I’ll have to pay for it.