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Picture of Jump Starting Car With Drill's Battery

3 years ago, I published an Instructables where I demonstrated a way to jump start a car using a battery from a drill.

Some people were not sure if it will work on bigger cars as the car I used at the time was Kia Picanto.

In this improved Instructable, we'll jump start 2009 Opel Zafira, 2L Diesel and discuss the best practices.

Step 1:

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You'll need a fully charged battery from a drill or other power tool.

It's important that the battery is indeed fully charged. A half charged battery might not give you enough power.

I used 14.4v battery.

Batteries between 12v - 18v should work just fine. Some people even reported using 20v batteries with great success, but I wold not go that high.

Depending on the battery you use, you'll need to get creative.

I connected small alligator clips to extend battery terminals. I put a sponge between the clips to avoid accidental s/c.

20v batteries are 18v nominal; it is for marketing that some manufacturers tout the fully charged voltage for the model lines. Whether 18v or 20v, they all use 5 18650 li-ions in series circuit. The extended batteries use parallel attached multiples of the original number of cells, varying by voltage, but usually in multiples of 3.7v li-ion chemistry; 4.1v is the fully charged voltage of a li-ion cell, but under load, 3.7v is what is sustained. It is specifically for marketing, Milwaukee, Makita, and Bosch(until recently) stuck with 18v nomenclature for their tools that are more powerful than most tool lines labeled 20v, though the actual voltages are identical.
Chris W.J1 year ago
This is a great idea, also for a dead motorcycle battery.
elpayo1 year ago

Thank's. it's a good idea in case of trouble

aideym1 year ago

I'll remember this next time my MG won't start. Which probably won't be long.

ShakeTheFuture (author)  aideym1 year ago

Cheers!

It's a little unclear, after 15 mins are you disconnecting the drill battery and then starting the car? If so this isn't a jump start, it's more of a boost charge. If the battery is still connected you are at very real risk of damaging the drill battery as it is not a deep cycle battery like the one in the car and the in rush of power from the alternator after the engine start could cause the battery to explode or at least burst and leak (either way destroying the battery). I don't mean to be negative, just looking for clarification and if my car was stuck and this was the only way to get going I'd certainly try.

I waited 10 minutes before starting the car. The battery remained connected.

Cheers!