Here it is. From autoblog green:

One of Firefly's newest batteries, called the Oasis Group 31, is on target for a summer release date. These batteries were unveiled in October, and AutoblogGreen reader Sean says that he's been paying attention this deep-discharge battery and that, " All of us with EVs are quite interested as these promise to double the range, quadruple the life, and weigh a bit less to boot!" Don't worry, Sean's quite aware that there's a real good chance that the Oasis Group 31 batteries will bring with them a substantial price increase, but when is that not the case when we're talking about new high-power vehicle batteries?

I just called firefly,the price will be around $490 per battery. Available from their website this summer.  Three of them will move my honda plugin hybrid conversion (work in ((DIY)) progress) 30 to 40 miles.  For 1500 bucks?  Not bad.

Can we expect nano-tech out of Firefly next?  Who knows?  I lobbied for a battety plant up here in n. wis.  We'll see, hehey.