tom said:Stretch2727,
Thanks for the explanation above regarding the 12v battery.
This is off topic. I noticed you also have the e-Golf. Can you tell us how do you like the e-Golf? What you like about it and what you don't like about it (vs. LEAF and MB B ED)?
(I test drove the e-Golf couple times earlier this year, and I would compare it to the Nissan Leaf, but not to the MB B ED. IMO, the B is a much better electric car because of the Tesla drivetrain and battery)
Just curious of your opinion and experience.
Stretch2727 said:Guys, I am an electrical engineer and worked in the auto industry for 15 years.
No risk here. Just be sure the B-class is "ON" so it does not completely drain the 12 volt battery. The HV battery will recharge the 12V. There is an onboard charger the keeps the 12V battery charged from the HV battery like the alternator on a regular car. Think of the other car you are charging as just an additional load on this battery, just like if you turned on your radio or lights. Of course, get the polarity correct! Red on Red, Black on Black.
I did many times with my Focus Electric when my Honda battery/alternator was giving me issues.
Don't worry about draining the HV battery either as a typical 12 battery has a few hundred watts of capacity. Nothing close to the capacity of the HV battery.
I will also add you can do the opposite. Use another car to jump the MB. Did this with the Focus Electric as well. It turned out to have a bad 12 volt battery. It had sat on the dealer lot for a long time before I purchased so I guess it was discharged completely which is not good the life of lead acid batteries. The dealer replaced after it went dead on me 2x. Yes the car would not "start"!
I think the 12V battery will stay on electric cars for a long time, if not forever. It allows the use of all the ICE developed components (radio, lights, instruments) and avoids the risk of high voltage in the passenger compartment. It is the bridge to the dinosaur cars. Tesla has one so this should make it clear it is here to stay.
wtzouris said:Has anyone seen the Mercedes 12v battery? Where is it? Can someone take a photo of the top of it? What is the size?
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