Missing protection circuit from cell.
Added 2018-12-05 00:24:21 +0000 UTCI thought most of this type of cell had a built in protection circuit on the same PCB as the gold contact pads.
https://www.youtube.com/watch?v=ZAeOkaEFPLA
I was double checking one to see if the current cut off at about 4.2V plus the internal circuit voltage. It didn't cut off, so I opened it up to see if the circuitry was missing or just faulty.
Comments
I can't find a way to post a picture here, so I'll have to link to the article I just wrote in G+. <a href="https://plus.google.com/+BrianAntoine/posts/UZqTuna1LM1" rel="nofollow noopener" target="_blank">https://plus.google.com/+BrianAntoine/posts/UZqTuna1LM1</a> Even with protection, Lithium isn't friendly. That tablet has been fine for years, and this week decided to convert to the Dark Side on me.
2018-12-07 04:37:00 +0000 UTCSomeone has suggested a device that could do an instant test and I actually think it might be viable. I'll have to test the theory when I get back. I'm in Glasgow at the moment.
Big Clive
2018-12-06 00:50:50 +0000 UTCThat dual MOSFET package is commonly used with the DW01. Keep in mind that you can get complete TP4056 based charging boards for incorporating lithium cells into projects.
Big Clive
2018-12-05 20:54:26 +0000 UTCcan i use 8205S with a DW01 ??
God 420
2018-12-05 15:22:07 +0000 UTCCool video. I wonder if there is a way to test for the protection circuits without taking them apart. Something faster and safer than just over-discharging or over-charging them to see if they cut off.
Nani Isobel
2018-12-05 05:53:17 +0000 UTCo_0 ........ thank you for this, I've been using these types of batteries for pretty much all of my projects and was assuming the protection was there. think I'll stick to the cells that arent cased (intended for newer phones) that I can see the protection board without having to destroy it.
Drachnien
2018-12-05 00:57:34 +0000 UTC
