I recently had a hard time finding an Odyssey 680 battery for my Jabiru powered CH 601. I went to Interstate Batteries to find a substitute and low-and-behold they have the Odyssey 680 in stock for a price that matches any internet supplier. BTW all of the internet suppliers were out of stock on this battery and reported that Odyssey is not producing it anymore. False! Interstate says there is a good supply of them available. It is a nice battery that is 13 lbs lighter than my original Concord RG25X. The Concord has crapped out three times on me, despite consistent refreshment on a very good battery conditioner. I do not recommend the Concorde for this application. Several flying buddies use the Oddyssey 680 and have very good performance form it, even in winter.