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Originally Posted by teoman
Those connectors look like laptop connectors. The laptop batteries have internal temp semsors and balance circuits...
If those are indeed the packs you have why not try to source the other half of the connector?
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They are modem batteries I believe. Printing something up so I don't have to disassemble them sounds like a great idea. I'm not sure I can make that work, but I will definitely look into it.
Quote:
Originally Posted by Piotrsko
If the yellow transformer is across the AC plug, they are isolated, that is why the transformer is there. It's cheaper to build a buck power supply that is transformer less but not isolated.
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I also tested for continuity and there was none.
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The diodes are getting hot because you are running max current the device was designed for, ditto on the capacitors because they are supplying current during the "off" portion of the cycle. I wouldn't run more than half the rated current without having heat sinks if you want any longevity or "surprise" oops events.
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They are rated for 5A, and I have them running at 4A. I figured 80% wasn't too much to ask, but perhaps it is. 3A would still be fine for these purposes I think.
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I would also be inclined to use the modules as is with the bms on top if they allowed charge to 4.2 @ cell. Which gives you 12.6v
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If that is possible, I could look into using a boost converter.