I've ALWAYS, since brand new in 2006, had slow starts when temperatures get to about 50 degrees or lower. Last fall I bought a new red top to see if it would help starting but it was the same. One morning last week I checked the voltage of the red top before starting and found it to be 12.4 volts

I've read ALL Liberties require good voltage or they won't start. I don't know if that's true or not. The next morning I charged it before starting to see if that helped. My automatic charger said it was full at 12.9 volts. Other batteries including my new AGM Die Hard P1 go highter before the charger shuts off. So then off to the Optima site and I found Red Top's full charge voltage is between 12.6 and 12.8 but at 12.9 my CRD started with out the extra cranking
There is a thread about slow to start at cooler temperatures that I was reading and Scott recommended a Sears P1 Platinum Die Hard that is also a AGM battery with 880 CCA's to the Red Top's 800 CCA's so it was a no brainer
That was a week ago and everytime I start it up I'm amazed at how fast the starter cranks the engine
You can bend the ground clamp to use the red top you bought. Optima was bought by Johnson Controls and it seems quality has gone down
With the P1 the posts fit perfect but I needed to add a 4 inch piece of Valcro to fasten the blancket around it
I'm now a believer. The one year old Red Top is working fine in my Wife's 2000 XJ that needed a battery so it was not a waste

Sears P1
http://www.sears.com/diehard-automotive ... 850034000P