Reversed Polarity of Unregulated Mod

[Noah Pan]

Ok so i think i placed the polarity in reverse in my mod and it started to heat up and something was sizzling so i chucked the batteries. Do you guys think i did some damage to the mosfet or anything

 

[dc99]

Its possible that the mosfet survived. You can check it with a multimeter if you have one or just slip one battery in and see

 

[suprtrkr]

Yeah, even money for a bet. I think it depends on if you put both batteries in reverse or just one of them. Both, it's probably gone. But if they were working against each other, it might not have damaged it. Try it. If it's a parallel mod, try it with just one battery. Or, if you have a multimeter, and you can see the mosfet so you can tell which pin is what, you can test it.

 

[Mooch]

Ok so i think i placed the polarity in reverse in my mod and it started to heat up and something was sizzling so i chucked the batteries. Do you guys think i did some damage to the mosfet or anything

Reversing the polarity across a MOSFET forces the current through a part of it called the "body diode". This generates a lot of heat compared to when the current flows in the right direction through the mosfet.

What was the resistance of your build? If enough current flowed to cause your batteries to leak, odds are the MOSFET is toast.

Do you have a single or dual battery mod? If dual, and you reversed one battery (and you didn't fuse each battery) then just the batteries will have fried. If a single battery mod, and you reversed the battery, the MOSFET is probably dead.

 

[zp1944]

Hey, i just did the same thing but only one battery was reversed. I wasn't paying attention and did that accidentally ( i know, big mistake) but if the mosfet's (dual mosfet) are still good then i will solder everythig back up and pick up some new batteries tomorrow. Would the mosfets still be okay?

 

[Mooch]

If you only reversed one battery in a dual parallel mod then no current should have flowed through the MOSFETs unless the batteries were very badly mismatched. The MOSFETs should be OK. Test with a high-ohm build first though.