hi, i'm trying to look into engine heating options.

does anyone have some recent info on webasto or other brand engine heaters, where to buy them, preferably 2nd hand?

i've read engine heaters can run on diesel, that works fine if i'm home and can bring a jug of diesel out from my apt, but if i'm on the road, say in the wilderness, the diesel will be in the car, and imagine also too cold to run the heater...

that brings me to wonder about modern portable batteries.
could they be used to power the block heater, which i read pulls 450 watts?

for example using batteries suitable for photography lighting gear:
https://www.paulcbuff.com/vagabond.php

or maybe stronger ones?
what do you guys think?

thanks.

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w123
1985 300D turbo sept 2015 - present
1985 300TD turbo oct 2023 - present
looking for biodiesel in nyc