i use an optima battery. Â*when i first got the z i tried using the strongest die-hard battery i could find off the rack at sears and it didn't have enough juice (CCA) to start my car really. Â*threw in an optima and it cranked the motor over a 10x stronger. but thats just cause its CCA rating is like double that of the highest one i found at sears. Â*so for me it's really been worth it.
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