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Originally Posted by iethinker
Thanks for the details. Do you know if all lithiums have a circuit board in them?
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No, it depends on the type of lithium batteries and if they are in serial or parallel. Most of the lithium batteries that a kayaker would consider using comprise multiple smaller cells lined up in groups of serial and parallel combinations to reach the desired voltage and amp-hour capacity. They need to have the BMS for safety and to balance the charge. There are DIU books on Amazon if one wanted to make their own Lithiums.