Hi, im also seeing this behaviour with my SteamVR 2.0 controllers. The charge LED remains orange even after the controllers are fully charged. After they are charged, if i unplug and replug the controller back in only then will it show up white, but it never turns white after they have been charged after use.
They are on the latest firmware as of today and it doesnt really matter what system spec i have as the computer isnt on while they are charging...
Cheers.