Overheating battery

It will. Each cell fully charged (surface charge discharged) is 2.1V. 6 cells together make 12.6V. Lose one cell and it will register 10.5V, Lose two 8.4V, etc

 

Make sure the alternator is not over charging also.

 

My Ford Windstar has a near 200 degree positive post. I think it's my grounds , or battery is old and junk.

 

If there’s heat there’s resistance. Usually the heat is at the resistance my bet is it’s your positive clamp has corroded under the clamp or it’s two thin (corroded away) to carry the amp load.

 

If you have a temp gun, and things are still working. Shoot your connections and along your cables, bad spots/corrosion/ will be hot.

Resistance and heat are a viscous cycle. They cause each other.

 

Make sure you keep all connections clean and tight. Resistance in connections will cause poor amperage transfer between batts. This can overwork batts that have main cables on them. Dont just look, wire brush clean lead to clean eyelet. New battery jumpers and nuts are cheap insurance for battery longevity.

In the long run it seems the batt connected with main cables will fail first, not always but more often that not, if they are all replaced as a group.

 

1 year warranty?
It's what i like. How much scientific resources it required to calculate warranty period such precisely.