Your buddy calls and says he wants to head out for a night ride. Of course you're into it. Then you realize that your battery is still in your pack from last night, spent. Your buddy isn't going to wait five or six hours while you charge up you just missed the ride. Don't let this happen to you. Have a spare Light Motion 11. 1v 2. 6Ahr 3 cell Li ion Battery charged up and ready to go, so when you get that surprise night ride invitation, all you have to suit up and hit the trail. The 11. 1v 2. 6Ahr 3 cell Li ion Battery is compatible with Light Motion Stella 300 as well as Seca 800 and 1700 lights. It comes with a handy clip on the outer case so it can be easily secured.