Yes, contact Garmin first. I know of a few Garmin GPS that were replaced out of the warranty period.
If that doesn't work:
I replaced the battery in my old 705 after about 4 years. It was showing "5% remaining" after riding just an hour or so. (Perhaps there was actually more time remaining than it calculated? I never tested it to shutdown.)
This company:
https://newpower99.com/products/garm...d-life-battery
(I don't see the installation video link for the Edge 130 battery. I'd want to review it before buying.)
The 705 replacement battery worked great, and lasted for years until the 705 developed CPU/memory problems. The replacement was easy on this device, just 6 small screws, the old battery was stuck down with double faced tape, and there's a small ribbon cable connector. They include the tiny screwdriver and a plastic tool for the connector. And a detailed video. Easy!
I think the newer Garmins are glued together, and I don't know how they would be done.