First, the orange/green light is only for the main battery and not the backup battery. So, it appears your backup battery needs to be replaced.
Second, I have a similar problem with mine when it's in the cradle. I have to make sure it's seated just right by wiggling it from side to side. This only happens in one of my cradles. The other one is just fine.
The question is, does your battery charge in the cradle now, even if you wiggle it a little bit?