Quote:
Originally Posted by AlaricD
Now, if one could also combine that block heater with a battery heater, AND a battery charger, so that when you turn the car to "Start" it adds a 50A boost, that would have another (albeit slight) advantage of giving the alternator less work to do when you first drive off in the morning. Many of us operate our headlights in the early morning hours (or have DRLs on all the time), and short winter trips can take their toll on car batteries.
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That company that MetroMPG linked to
DEFA WarmUp - Start page offers a battery charger with their package option with temperature compensation to maintain proper voltage in the cold.
I don't think its a good idea to offer a device that encourages you to start your car while still plugged in, but topping off the battery before you start your car seems like a good compromise.