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    Need help with battery build/balance charge

    The error seems to suggest that the input power you're supplying to the charger isn't sufficient for it to fully power up and start charging. Can you confirm that whatever DC power source you're using is within its acceptable range, even under charging load?
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    Diy ltc 6802-2 BMS?

    Hi eranrund, thanks! On this board, the DC/DC is actually powering the HV isolated side. I wanted to leave the method for stepping the battery voltage down to logic levels to the end user, to keep it more flexible for different needs. The built-in 6802-2 LDO is unfortunately just shy of being...
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    Diy ltc 6802-2 BMS?

    Yep, I've got a few on hand and the ability to produce more at smallish scale. You're right, those 44-SSOP packages are tricky without a jig and solder paste stencils. Board house assembly isn't prohibitively expensive, but I wanted to see if other people were interested before investing in the...
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    Diy ltc 6802-2 BMS?

    I'm also quite eager to hear about existing open-source BMS projects around here! I feel like I've seen a couple references to LTC680x projects before, but haven't had a chance to do enough digging yet. I'm hesitant to post because I suspect there may be better/more mature projects already out...
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    Cool student project!

    jonescg: Yeah, that's a great point about the ampacity. We should have stuck a milli-ohm meter on there and seen what the typical resistance ended up at. Rube: Yep, those were (close to) pure nickel terminal plates. Sorry, the illustration isn't very clear. 0.13mm was the thickness of the...
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    Cool student project!

    Hi all, Came across this post by random chance and though I'd chime in. I oversaw the design of the team's battery and co-designed the BMS that year. I'm really glad people found it interesting! It's been a while, but I can try to answer a few of the questions: The electrical isolation...
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