I upgraded my Ballistic lithium battery to their 16HD (I had issues with the first one...I'll be posting about that and how excellent Ballistic's custom service is).
The 16HD is a beast - Pulse Cranking Amps: 500 CCA. It's pricey but performs extremely well and is warrantied for 3 yrs. Recommended.
WOW! that is a beast... ima save my pennies for that one then... thanks!