On the hundreds of reviews for this charger on HF it seems to have done well for others to bring back totally dead batts. I am pretty good about checking out purchases before grabbing from the shelf and running.

I may run up to HF to see if they have a dumb charger in a bit and try to give this a slow charge for an hour and see if it makes a dent.

Thing is, after uncovering the battery it is an Interstate with a 6 year warranty. Looks like a decent battery but I have no idea if it's 2 years old or 10 years old as whomever installed it did not mark it in any way :-(. I am always good about writing that with a sharpie. So it "could" be time for a new one.