Help Cold Starting a Diesel NO CORDS

Maybe I’m a little goofy for suggesting this method . . . but here goes: I have one of those jump-start battery pack things in my trunk all Winter. I charge it every week or so, rarely ever used it. Couldn’t you charge one of these overnight in your nice warm apartment and then (on very cold mornings) bring the battery pack and a hair dryer (like Rod Knox suggested above) down to your truck and warm the combustion chamber a bit and then try and start it? I think that the battery pack would run down in 10-15 minutes using a hair dryer, but even more quickly with say . . a block or dipstick heater. Seems like you need portable heat once in a while . . this is what I can come up with. This is AFTER you have changed the motor oil to the lowest viscosity you can and after you have added an additive to the fuel. Good luck! Rocketman