Hi there, I have a 18650 li-ion battery rigged so it has a 2-pin jst connector as an output. The website for the Adafruit Feather M0 Adalogger says that it would work for li-ion batteries in one place but not in others so i am a bit confused. it mentioned about polarity of battery. So i was wondering if i shopuld buy the Adafruit Feather M0 Adalogger for a project considering the battery I have.
Many thanks.
I assume you read the warning about battery polarity.
Is your battery a protected or unprotected type?
yes I did,
I am not 100% sure if its protected. Is there a way to check?
If it is unprotected, what would that mean?
Thanks.
Somewhat dangerous to use. If you accidently shorted something, the battery could over heat, explode, catch fire.
Most batteries sold today are protected, however if they were cheap they might not be.
What information is printed on the battery?
Where did you buy them?
It is a Samsung INR18650-35E cell with photo below. I was given this by the school for the project so not sure where it was bought from. I also think it's DIY made. IE it didnt come with the jsp connector. I think it has the same polarity as shown in the second image as the Li-Poly battery as shown in the web page
It appears to be unprotected. The polarity seems to be the same, but that is simple to check. BTW, it's JST, not JSP.
Based on the information provided that is all I can tell you. Good luck.
It's unprotected.
I personally would not use that battery with the Adafruit M0.
okay thank you guys, i'll try something else then
It is the pin polarity of the JST battery connector that is so critical. If it is incorrect, swap the pins in the connector. Red = plus, and for Adafruit boards, must match the order in the connector below.
The problem with unprotected Li batteries is that they are destroyed when discharged below a certain voltage.
I'm very surprised that your school gave you an unprotected battery.
Unprotected batteries can be dangerous, that is why battery manufacturers started putting protection circuits inside the batteries.
yh I believe that the polarity I have is correct but I am not going to risk it
Yeah i guess they just gave me what they had?
You can put a 2A fuse in series with that battery and use it in other projects but the Adafruit M0 has a builtin charger and if something goes wrong with the charging, the fuse won't help.
okay thanks