Protect MOD with short circuit protection

[walterdsouzajr]

How do I protect my Homemade mod with short circuit protection? I need it small ofcourse.

 

[DaveyRoots]

your best bet is to just use a protected battery...

 

[Ryan Toupal]

That's what I was wondering. Once my mod wasn't working so I took a DMM to it. I thought the switch failed because it wasn't reading a voltage at the atty when I pressed it. I realized the batteries were shutting of completely and I actually had a short. The protection was working.

I got a somewhat short the other day though the parts got red hot and killed my battery for good.

At what resistance do the batteries protect?

 

[Rocketman]

I think (guess I could short one just to find out) the large cells like the 18650 (not the high discharge rate cells) will cutout at 4 to 4.5 amps. If the short is still there when they come back on then you could destroy the FET switch in the protection circuit. Without the protection circuit a laptop 18650 cell will conduct about 10 amps. That is still more than enough to vaporize some switch parts. How many parts do you think could survive a high discharge cell short circuit with 40+amps?
I have a radio controlled speed control circuit for an electric motor that is rated for 60 amps from a 4 parallel/3 series HD Lipo pack. If you design for the current, parts can take it.

 

[mwa102464]

look at the fuse system Imeo uses with his GG line, I have it and it awesome even using protected batts they can still dischage gas, the new fuse in the GG's is an awesome idea Imeo came up with, very simple too, and great piece of mind

 

[Ralph T]

your best bet is to just use a protected battery...

If you don't want to trust the "protected" battery, you could place a polyfuse in the circuit. They are small. So, then the polyfuse would provide an additional layer of protection.

 

[Rocketman]

also adds one more layer of fun when troubleshooting a short in your homemade mod