Optima brand batteries are excellent. Any of these would be good for your Jeep. The bold number are the Group numbers. 25 (8025-160) RedTop® 34 (8002-002) RedTop® 34/78 (8004-003) RedTop® 75/25 (8022-091) RedTop®
50% water to 50% coolant is the standard unless you live in a very cold climate where it goes down to -25 degrees F or lower, then you may want to mix 25% water to 75% coolant but never straight coolant.