Originally Posted By: hemitom
The trickle charger is a good idea and works wonders, on sub 0 temps my battery turns the truck over like it was summer.
The problem with the cold is that the battery's CHEMICAL capacity is reduced. At low temps "fully charged" electrically will be a fraction of the true "chemical" charge possible at higher temperatures. Said another way, you could trickle charge a battery infinitely at 0F, disconnect then warm it to 70F and it may only be 30% charged.
I've never needed such a beast, but this is where the battery warmer comes into play. All of my numbers are pulled from my head based on past reading - I don't remember any quotable references at the moment.
The trickle charger is a good idea and works wonders, on sub 0 temps my battery turns the truck over like it was summer.
The problem with the cold is that the battery's CHEMICAL capacity is reduced. At low temps "fully charged" electrically will be a fraction of the true "chemical" charge possible at higher temperatures. Said another way, you could trickle charge a battery infinitely at 0F, disconnect then warm it to 70F and it may only be 30% charged.
I've never needed such a beast, but this is where the battery warmer comes into play. All of my numbers are pulled from my head based on past reading - I don't remember any quotable references at the moment.