Aw, c’mon; billions of PCs out there have 2032 coin cells and they don’t fail that often 
Think it through
Push the unlock button on the remote, it partially wakes up the car’s network, and unlocks the doors call it a 10A load for less than a second.
Open the door, interior lights, call it 1A
Insert the key and turn to accessory, network comes alive, 11A (yes 11Amps, I’ve measured it)
Turn the key to on, the daytime running lights come on, we are now at 15A
Also when the key goes to on, the fuel pump energizes for 1 second add 6-8A additional.
When the car goes into crank, you will need about another 6A for the injection and ignition systems.
Excluding the starter draw, you are going to need about 25-30Amps to start the car.
Go watch Apollo 13 then come back and tell us just how many of the 2032 cells are you planning on installing in your car? How long do you think they will last? One key cycle, or do you think they might make it to 2?
The winking smiley didn’t tip you off?
:smack:
I hate those cars. Whenever you lock your car with the remote control, the only way to unlock it without setting off the alarm is to use the remote. That battery in your remote is going to die some day, and you’re betting 50/50 odds that it’s going to die when you lock your car, rather than unlock it.
That said, you also need electricity for the ALARM. Unless you want the car to mechanically explode or something when somebody tries to steal it.