Just installed the Siemens Versacharger in my garage to charge my TWO (yes two) brand new Fusion Energis. I noted similar things: Cars are 'fully charged' yet charger still says charging. I'll have to investigate this 12V battery drawdown issue. Also, my charge from Amazon was $599 (approx. $645 w/tax) and install was $650. No tax credits per se, but there are other 'green car' rebates from CA Air quality board and US IRS. I will keep you posted on the Versacharger operations. At first blush, seems like a well made unit, and I must say I do like the neon leds in the dark garage at 1am...I've seen it once. Note that charger prices are dropping. Expect this unit and its competition to be in the $450-$500 range by Christmas. Cheers!