Odyssey PC680 or Equivalant Questions

[Chim55117]

I was wondering if anyone is running the Odyssey PC680 and how it is doing with their cars. I actually have several questions regarding them.

1. There are 3 versions of the PC680, the PC680, PC680M and the PC680MJ, what are the differences in this? There are price differences.

2. I have heard reports of owners leaving their cars for about a week and the battery being totally dead. Are these AGM style batteries prone to losing charge rapidly?

3. How do these batteries perform in the cold? The CCA rating seems somewhat low to me but I thought I would ask those who actually have had experience using it in the cold.

4. I have heard there are cheaper versions of this battery, with the same specs, but simply rebranded. Is this true?

Thanks in advance,

- Stephen