I noticed that sometimes when I get home, my C-Max battery is pretty low on charge (maybe 1/5 or 1/4 charged). I was thinking it would be nice to charge that battery up over night. But I'm not interested in a bigger battery like the Energi. I simply want the Hybrid's battery to get charged. What would it take to accomplish this? Would it be possible to do it w/ a portable solar cell so I can set it up at work? What I am thinking of is some sort of portable unit with a power cord where on one end has a quick-disconnect and on the other end, connects to the Hybrid's battery so that this cord can stay inside the car and remains connected to the battery for easy connect/disconnect. Then, portable unit that can be connected to the wall or to a portable solar cell panel. Sort of like those battery tender devices but capable of delivering enough amperage or wattage (?) to charge the high-voltage battery in the Hybrid. Thoughts? Referrals? Links? Thanks!