Making use of a Prius battery pack

So, in allaboutprius.com there is this article about whether we should buy used battery packs, just in case. Supposedly they are cheap ($500) at present. Seems like it doesn't make sense for keeping to maybe power your Prius, but howzabout for other things? Seem prime for a hackaday.com project. Does anyone have the plans for a 110v. charger and a way to drop the 200+ v to either 110 AC or 12v dc? Seems like a great UPS project. Or a heck of an LED flashight.