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Any suggestions how I might use my M3 to start my oldtimer with a drained battery?
The model 3 12 volt battery can't put out enough current to jump start another car. This is obvious if you just look at the 12 volt battery. It is like one-third the size of a normal car battery.
However, if you connect the other car's battery to the Tesla's 12 volt battery and walk away for a few hours, the Tesla will charge the other car's battery. Then you can disconnect the Tesla and start up the other car.
I feel like dead 12v batteries have become fairly rare on ICE vehicles. Modern cars generally turn stuff off before the voltage gets too low. Often times a car that need to be jump started will not be able to start again on it's own until after its battery is replaced.
Don't forget - the 12V battery in a Tesla is a deep cycle battery. It was never intended to start an ICE engine.
If you find that you're not driving your ICE vehicle as much, I'd suggest getting a battery maintainer for it. A small trickle charge keeps everything in tip-top shape and avoids the need to get a jump start and the battery damage that entails.
Last summer I was flying drones with my son in a park. The wife is sitting in our 2014 Honda CR-V in accessory mode, charging her phone and listening to music. 30 minutes later we went to drive away and you guessed it the 12v battery was near dead, not even clicks when turning the ignition key. The battery was 3 years old, and it was our only source of transportation for 5 years (the car got driven 28 days out of 31).
I have a portable jump starter/battery charger, but it keep reading an error, so I called AAA, they arrived and charged the battery (AAA supplied 3 years ago). They took a reading on the battery and said it was under charged, failing, and I should look at replacing it in the next few months. I hassled the guy about their top of the line battery only lasting 3 years before an iPhone can drain it in 30 minutes.
Spent $150 on a new battery the next day. Hopefully it lasts longer than 3 years.
I'm impressed they covered the battery replacement under warranty. When our first one went out, we were under warranty, but the service manager said like tires, brakes, and wiper blades, they considered the battery to be excluded from the bumper-to-bumper warranty. I have to say, I expect better from Honda, especially for one of their top models.My 2013 Honda CR-V did the same thing. Battery seemed fine (no stutter cranking or dim headlights) but the one time I used accessory mode for less than an hour, the battery crapped out, and even after a full charge at home, then started slow cranking, etc.
Also a family member has a 2017 CR-V and their battery went out twice in less than 3 years. Honda covered it under warranty both times but it was a bit odd since it's a fairly new car.