so long story short the Battery Tender Jr and The HD battery Tender are near identically internally. I recently had to replace a capacitor in my Battery tender Jr, an Buddy of mine has the HD version and I gave him an extra capacitor that I had that also repaired his. Do a you tube search on reparing an Battery tender JR, Great video.My tender flashes/blinks green. Am I good? Seems to me it used to be solid green when it was plugged in and flashing yellow when it was unplugged.