Jump-Start Your Car With Drill's Battery

My car's battery was dues to be changed. Every time I started the car, I could hear that one day it will not start.

Monday morning, I have an important meeting at 9:00. I am ready to leave my house, but I can't start the car.

Battery does not have enough juice. In the area I live, there are no cars around. I could ring my friend to give me a lift or a jump-start, but it will take at least 40 minutes.

There is no way I can push-start my car.

Time is running out. I go inside and pull out the battery from my drill.

It's 12v battery, just like my car's.

I tape 2 screws to the batteries + - terminals.

I connect the both batteries together using jump leads.

I wait 10 minutes before trying to start my car. After 10 minutes, I manage to start my car.

Let's go to the meeting and on the way back, pick up a new battery.

I got lucky this time.

A made up story, but it could be real :)

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This little trick should work the best if:

Your drills battery is charged, big capacity and the same voltage as car's battery or a little bit higher.

I used 12v drill battery to hook it with my 12v car's battery. I believe it should be fine to connect 14v, 16v battery, but I am not 100% sure at what point do you cross the line, putting your car's electronics at danger. That's why I recommend using the same voltage battery. If you know the answer, please let me know in comments.

Your car's battery is not completely dead.
If you own a small car with a small battery.

It's not the smartest thing to do, so only try it out if there is no other way. There is always a small chance of destroying your drills battery or messing up your cars electronics. 99% of times nothing bad will happen, but let's put it that way. I would not jump-start my "Porche" this way.