so I'm about to buy a better primary battery and eventually put in a second matching one in back once I get a bigger sub amp. I was thinking kinetic because I've heard nothing but good things but I'm open to any suggestions. I do listen to my radio when the car is off from time to time at work, no longer than 20mins at a time maybe 4 times a shift but my current cheapo battery handles that fine. I plan in saving this battery for winter unless anyone knows if the good kinetic,batcap or similar are capabale of handiling below 0 temps.