can i heat up my car battery to make it work
Your best bet is to jump the battery from another car.
Once it starts, see if it will hold a charge. If not you may need a new battery or have a problem with the charging system.
it may be able to produce more, but just slightly, by heating it to house temperature.
if you can’t start the car you need a jump or battery charge.
A lot of this depends on exactly what you mean by “can i heat up my car battery to make it work”.
If a battery is dead because you’ve drained the electricity from it, then heating it up won’t do much. Disconnecting the battery and bringing it inside and letting it sit for a while may allow it to recover some, but this is more due to the charge migrating from the interior of the battery plates to the exterior than the change in temperature.
The electrolyte in a typical car battery is a mixture of water and sulfuric acid. If the water has frozen, then bringing the battery inside and letting it thaw will allow it to work again. The electrolyte in a fully charged battery freezes at a rather ungodly low temperature (-92 deg F) which most folks aren’t likely to ever encounter. A drained battery will freeze at much more normal winter temperatures though (-16 deg F for a 40% charged battery, still a bit cold, but not out of the question for many folks in the world).
This cold spell we went through last week and just starting again tonight (forecasted) is going to tax any old or undercharged battery.
I was visiting the parts store where i used to work (and still help out) and the battery shelves are running low now. The only folks that dread this season besides the customer is the freight company that brings in the new and hauls out the cores.
My daughter called me for a jump start a couple days ago and after connecting and giving the dead battery 15 min of charge her Yukon started right up, only to die a few min. later. I put my charger on her battery overnight and the next morning the battery was still so dead the starter wouldn’t engage, just the solenoid clicking away.
A dead battery in -20F left uncharged for even a couple hours is junk whether new or old, and any bulging (indicator of freeze/frozen) will void any warranty.
Maybe for a brief time, but I have never seen an automotive battery return to any kind of practical usability after freezing. If it froze, replace it.
Yeah, just toss it into a 350 degree oven for 45 minutes, you’ll be golden.
Brown and delicious.
Just in case you’re actually thinking of doing this …don’t it’s a joke. 
Auto parts stores who sell batteries will usually test your battery for free.