I use an Odyssey dry cell. It weighs more but I've taken off a lot of other weight. It cranks much more powerfully even when engine is hot and I have 11:1 so its great to not have to worry or charge it -- it is always ready with bigger power than regular batts.
http://www.odysseybatteries.com/battery/pc680.htm
Al 96 Sp Ohlins, FCR 11:1