Question about automotive battery boosters...

[809]

What is to stop me from wiring up a whole bunch of 18650 batteries and attaching them to a simple heavy duty switch and using that as a battery booster? Is this unsafe?

What about using power tool batteries as battery boosters? I know that they have over current protection. What if I bypassed this?

What's the worst thing that could happen if I tried either of those methods?

 

[RPH]

This

 

[809]

This

That's pretty cool.

 

[KenC]

The first item is pretty much what is in the little jump boxes. With some discharge protection as a dead short of the output can cause battery meltdown/fireworks without it.

 

[809]

The first item is pretty much what is in the little jump boxes. With some discharge protection as a dead short of the output can cause battery meltdown/fireworks without it.

I'm not at all electrically inclined. I'm assuming a dead short in this case would be the jumper leads touching one another?

 

[Showkey]

Dead short can occur inside the battery not just the leads. As in manufacturing error or physical damage that starts the process. Recent Chevy Bolt recall isa manufacturing error.

One thing lithium batteries do not like is over current draw or unregulated charging.
The consequences of either is cell runway or melt down …….usually ending in fire.

Its the reason for recall in lithium battery powered products from cars, tools, laptop, toys, vape pens etc.
Its the reason lithium battery are not allowed to shipped on airplanes.

The battery protection systems built into the battery……..Its often the difference from “real branded“ battery vs an aftermarket or counterfeit battery sold at a fraction of the OEM battery.

Thermal runaway of the lithium-ion battery initiates an unstoppable chain reaction. The temperature rises rapidly within milliseconds and the energy stored in the battery is suddenly released.

 

[mike93lx]

I'm not at all electrically inclined. I'm assuming a dead short in this case would be the jumper leads touching one another?

Not being electrically inclined and playing with lithium ion cells don't go great together.

Think of them as little pieces of dynamite and you'll probably stay safe

Buying a new car battery would be smarter . If that isn't enough for some reason, add a second and an isolator