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Engine pad heaters come in 12 volts but you would do well to have a timer on it. If you were running a deep cycle battery, like a yellow top or a regular flooded one, you could easily heat your block at work.
You might want to charge at home though because your alternator will be working overtime to charge that battery. Next level of difficulty would be installing a field coil switch to turn off your alternator for the drive home.
Good luck
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