If you find reversed leads like this, you can carefully pry up the retaining tab on that JST connector, pull the wires attached terminals out, and re-insert the wires and terminals. You may need to push the retaining tabs back down after removal.
No, there's no standard in place so either way is perfectly acceptable. If the battery was listed as specifically for a certain device and then was still backwards, maybe there'd be some grounds for fines.
We are speaking about negative being red and possitive being black in this case in picture/OP?
And yes you are correct, I don't know why I phrased it the way I did, I just couldn't fathom anyone anywhere faced with a red and black wire would connect the black to possitive and the black to possitive.
https://preview.redd.it/tmkc56rg6xnc1.png?width=1080&format=pjpg&auto=webp&s=09d661634e0a07e4a9ee7abc415ca09336a2a6a9
If you search XT60 pinout the first image result is backwards... For a high power connector...
If you are just doing it for safety, you don't need a full bridge rectifier, a single diode will work. Sure, the circuit will only work one way, but you won't let the magic smoke out.
Also related PSA on your multimeter make sure your leads are plugged in the right sockets, these have been flipped unbeknownst to me and i fried a nice touch screen monitor.
Measuring what? It doesn’t really work like that so I’m curious as to what you were trying to do. Cus unless you shorted a cap or something or were trying to use the ammeter like a voltmeter I don’t really see how you’d fry the monitor with backwards leads
From experience working in industry: do not care about which colors is which, measure all new batteries before plugging. Production at my job mixes them up regularly…
**This was the reason why my SIM900 module regulator got damaged**. It had reversed leads from the store (within the same module pack). It's his fault for selling a wrong connector within the module pack, but I should have also checked it before using.
Don't throw them away!
Often with boards like this, there will be a diode that will be at the input - although this is generally on the USB end for protection. If you desolder it (surface mount but can use an iron), you can short it with a resistor leg.
Alternatively, if you check the output of the 3.3v regulator -- if that doesn't output then hopefully that's all that is broken - very cheap and simple to solder on a new one.
Hope this helps!
I have found that all non-hobbyist sources of batteries that offer wired connectors in the JST-2 format that I have used are wired backwards relative to adafruit and sparkfun, Olimex, etc.
I have no idea who set the standard or why this reversal exists. It is easy to fix, and I carefully verify every battery I get in before I attempt to use it. Never assume a battery is wired correctly, check it with a meter.
If you find reversed leads like this, you can carefully pry up the retaining tab on that JST connector, pull the wires attached terminals out, and re-insert the wires and terminals. You may need to push the retaining tabs back down after removal.
That requires you to see it first.... I personally dont look twice on my battery connectors usually
Some online shops warn you that the wires may be incorrect and to check the connector in advance
Neat i mean i will watch out for this from now on
In Europe this would cause massive fines? Me think?
No, there's no standard in place so either way is perfectly acceptable. If the battery was listed as specifically for a certain device and then was still backwards, maybe there'd be some grounds for fines.
In anywhere, with li-ion batteries, if the fail-safes fail, it could cause massive Fires ;-)
We are speaking about negative being red and possitive being black in this case in picture/OP? And yes you are correct, I don't know why I phrased it the way I did, I just couldn't fathom anyone anywhere faced with a red and black wire would connect the black to possitive and the black to possitive.
Should always confirm the wires are right when you get a new battery especially if it’s not the same as you usually use
You might also check the voltage with a meter. Wire colors alone can be unreliable too...
I always do this with new lipos now, I fried two boards because the battery was wired wrong.
Trust nothing but your multimeter.
New fear unlocked. Now I'll test everything.
As well you should.
They never match. Always check.
https://preview.redd.it/tmkc56rg6xnc1.png?width=1080&format=pjpg&auto=webp&s=09d661634e0a07e4a9ee7abc415ca09336a2a6a9 If you search XT60 pinout the first image result is backwards... For a high power connector...
at least with XT60 it has the +/- molded into the physical connector itself, hopefully most people won’t search it
It even contradicts itself
holy\* that's why i damaged my D32 lolin........
I’ve damaged a board assuming there was some standard. Thinking of adding a bridge rectifier on my next design so the battery polarity doesn’t matter.
If you are just doing it for safety, you don't need a full bridge rectifier, a single diode will work. Sure, the circuit will only work one way, but you won't let the magic smoke out.
Not for safety and more for customers plugging in random batteries.
More importantly, don't assume "the other guy" paid attention, and always test/verify.
I just did the same thing recently. POP! Then the smoke came out. I was mad at myself for not checking.
Also related PSA on your multimeter make sure your leads are plugged in the right sockets, these have been flipped unbeknownst to me and i fried a nice touch screen monitor.
How would the leads being switch cause issues?
Maybe when they tested polarity it was correct but only because the leads were reversed.
Reversed nothing, maybe they meant one lead in the ammeter socket
Measuring what? It doesn’t really work like that so I’m curious as to what you were trying to do. Cus unless you shorted a cap or something or were trying to use the ammeter like a voltmeter I don’t really see how you’d fry the monitor with backwards leads
Made the same mistake on my 3d printer when I was installing new fans... Some transistors on motherboard kinda blowed :)
Ha ha I've done that, only to see the white smokey spirit of my Arduino ascend to the heavens.
Get a pin extractor and swap the slots
From experience working in industry: do not care about which colors is which, measure all new batteries before plugging. Production at my job mixes them up regularly…
This is why you don't trust colors and check with a multimeter to make sure that everything is good. Better to be safe than sorry.
**This was the reason why my SIM900 module regulator got damaged**. It had reversed leads from the store (within the same module pack). It's his fault for selling a wrong connector within the module pack, but I should have also checked it before using.
Yeah... I found out the hard way by blowing up my LiPo Solar Charge Controller.
Yep. Adafruit batteries and connectors are reversed compared to everyone else.
Was there blue smoke?
i buy adafruit batteries all the time. which battery was it?
Surprised they don't have a diode in there or any protection from putting it in backwards
Don't throw them away! Often with boards like this, there will be a diode that will be at the input - although this is generally on the USB end for protection. If you desolder it (surface mount but can use an iron), you can short it with a resistor leg. Alternatively, if you check the output of the 3.3v regulator -- if that doesn't output then hopefully that's all that is broken - very cheap and simple to solder on a new one. Hope this helps!
I have found that all non-hobbyist sources of batteries that offer wired connectors in the JST-2 format that I have used are wired backwards relative to adafruit and sparkfun, Olimex, etc. I have no idea who set the standard or why this reversal exists. It is easy to fix, and I carefully verify every battery I get in before I attempt to use it. Never assume a battery is wired correctly, check it with a meter.