Been using the HD battery tender for about 4 years. Battery is about 1 year old stock HD.
I use the tender daily and it usually turns green in a few minutes at most.
Plugged it in today and after several hours still red. Then I unplugged from the bike end and the light changes to green with nothing connected.

Plug it back in and it switches back to red.
Looks like it's time for a new tender.
__________________
_______________
04 softail standard
Baisley-Axtell 117 - Baisley pro street heads - Baisley hybrid injection
Bob Wood TW-8 - Darkhorse crank - P.M. Hydraulic clutch
P.M. 240 Phatail - Roland Sands Design air filter
P.M. Villain wheels-rotors
Paint by J. E. Illusions - Powder coat by Sumax
Builder - hdryder